datavorous/entrance-exam-dataset huggingface dataset:
Which of the following is the correct statement for respiration in human?

Options:
A Cigarette smoking may lead to inflammation of bronchi
B Neural signals from pneumotaxic centre in pons region of brain can increase the duration of inspiration
C Workers in paper making industries may suffer from lung fibrosis
D About 90% of carbon dioxide (CO2) is carried by haemoglobin as carbamino haemoglobin

The correct answer is:
Cigarette smoking may lead to inflammation of bronchi

Solution:
Cigarette smoking may lead to inflammation of bronchi and workers in grinding and stone-breaking industries may suffer from lung fibrosis. Neural signals from the pneumotaxic centre in pons region of the brain can limit the duration of inspiration. About 10% of carbon dioxide (CO2) is carried by haemoglobin as carbamino haemoglobin.

Topic: Biology, Breathing and Exchange of Gases, NEET
Which of the following is the correct structural formula and name for the coordination compound CrCl₃⋅4H₂O, which precipitates silver chloride when treated with silver nitrate, and the molar conductance of its solution corresponds to a total of two ions?

Options:
A [Cr(H₂O)₂Cl₃] - Dichloridobis(aqua)chromium(III)
B [Cr(H₂O)₄Cl₂]Cl - Tetraaquadichloridochromium(III) chloride
C [Cr(H₂O)₄Cl₂] - Tetraaquadichloridochromium(III)
D [Cr(H₂O)₆]Cl₃ - Hexaaquachromium(III) chloride

The correct answer is:
[Cr(H₂O)₄Cl₂]Cl - Tetraaquadichloridochromium(III) chloride

Solution:
Correct Option is : (B)
[Cr(H₂O)₄Cl₂]Cl - Tetraaquadichloridochromium(III) chloride

Topic: Chemistry, Coordination Compounds, NEET
Which of the following is the correct symbol for SI units of electric current?

Options:
A I
B C
C A
D E

The correct answer is:
A

Solution:
Correct Option is : 3
A

Topic: Chemistry, Some Basic Concepts of Chemistry, NEET
Which of the following is the correct symbol for SI units of Temperature?

Options:
A T
B A
C S
D K

The correct answer is:
K

Solution:
Correct Option is : 4
K

Topic: Chemistry, Some Basic Concepts of Chemistry, NEET
Which of the following is the correct Third ionisation enthalpy order of Group 13 elements?

Options:
A B>Ga>Tl>Al>In
B B>Al>Ga>In>Tl
C B>Al>Ga>In>Tl
D B>Ga>Tl>In>Al

The correct answer is:
B>Ga>Tl>Al>In

Solution:
Correct Option is : 1
B>Ga>Tl>Al>In

Topic: Chemistry, p Block Elements (Group 13 & 14), NEET
Which of the following is the correct unit of first order reaction?

Options:
A Mol L-1s
B s
C s-1
D Mol-1L s-1

The correct answer is:
s-1

Solution:
Correct Option is : 3
s-1

Topic: Chemistry, Chemical Kinetics, NEET
Which of the following is the correct unit of Second order reaction?

Options:
A Mol-1L s-1
B Mol L-1s
C Mol L-1s-1
D Mol L s-1

The correct answer is:
Mol-1L s-1

Solution:
Correct Option is : 1
Mol-1L s-1

Topic: Chemistry, Chemical Kinetics, NEET
Which of the following is the correct unit of zero order reaction?

Options:
A Mol L-1s
B Mol L-1s-1
C Mol L s-1
D Mol-1L s-1

The correct answer is:
Mol L-1s-1

Solution:
Correct Option is : 2
Mol L-1s-1

Topic: Chemistry, Chemical Kinetics, NEET
Which of the following is the disproportionation redox reaction?

Options:
A 2CH3COOHâP2O5/Î
B 2CH3CHOâdil NaOH
C 2CH3COCH3âMg-HgH2O
D 2HCHOâ50% NaOHaq

The correct answer is:
2HCHOâ50% NaOHaq

Solution:
This is the Cannizzaro reaction and product formed by disproportionation reaction.

Topic: Chemistry, Aldehydes and Ketones, NEET
Which of the following is the dominant character according to Mendel?

Options:
A Terminal flower and wrinkled seed
B White flower and yellow pod
C Tall plant and rounded seed
D Dwarf plant and yellow seed

The correct answer is:
Tall plant and rounded seed

Solution:
Mendel studied seven pairs of contrasting characters in Pisum sativum. Mendel selected 14 true breeding plant varieties, as pairs which were similar except for one character for contrasting traits.

Characters	Contrasting traits
Dominant	Recessive
1. Stem height	Tall	Dwarf
2. Flower colour	Violet	White
3. Flower position	Axial	Terminal
4. Pod shape	Inflated	Constricted
5. Pod colour	Green	Yellow
6. Seed shape	Round	Wrinkled
7. Seed colour	Yellow	Green

Topic: Biology, Principles of Inheritance and Variation, NEET
Which of the following is the economic importance of algae?

Options:
A Algin is a unicellular alga rich in proteins used as a food supplement.
B Chlorella produces large amounts of hydrocolloids.
C Gelidium and Gracilaria are used to grow microbes and in preparations of ice creams and jellies.
D None of the above.

The correct answer is:
Gelidium and Gracilaria are used to grow microbes and in preparations of ice creams and jellies.

Solution:
Gelidium and Gracilaria are used to grow microbes and in preparations of ice creams and jellies.

Topic: Biology, Plant Kingdom, NEET
Which of the following is the economic importance of archaebacteria?

Options:
A used in the production of vitamins, Antibiotics, cheese and curd.
B used in biogas production
C used in the formation of humus
D none of the above

The correct answer is:
used in biogas production

Solution:
Archaebacteria are used in biogas production.

Topic: Biology, Biological Classification, NEET
Which of the following is the economic importance of heterotrophic bacteria?

Options:
A used in biogas production
B used in production of vitamins, antibiotics,cheese and curd
C used in bioleaching of mines
D none of the above

The correct answer is:
used in production of vitamins, antibiotics,cheese and curd

Solution:
Heterotrophic bacteria are used in the production of vitamins, Antibiotics, cheese and curd.

Topic: Biology, Biological Classification, NEET
Which of the following is the electron deficient molecule?

Options:
A $\mathrm{C}_2 \mathrm{H}_6$
B $\mathrm{B}_2 \mathrm{H}_6$
C $\mathrm{SiH}_4$
D $\mathrm{pH}_3$

The correct answer is:
$\mathrm{B}_2 \mathrm{H}_6$

Solution:
In diborane, 8 covalent bonds and 12 electrons are present. But it requires a total 14 electrons to form bonding. It lacks 2 electron pairs and forms a $3 c-2 e^{-}$bond. Thus $\mathrm{B}_2 \mathrm{H}_6$ is electron deficient.
Related Theory
The boron atom is known to be $s p^3$ hybridized and has four hybrid orbitals. The two electrons of the hybrid orbitals in each of the boron atoms form 2 bonds with the Is hydrogen atoms. The two atoms of boron left with that of each unpaired electron orbital and empty orbital forms the two bridging $(B-H-B)$ bonds with that of the two Is hydrogen atoms, is also called as the banana bond.

Topic: Chemistry, p Block Elements (Group 13 & 14), NEET, NEET 2005
Which of the following is the enantiomer of the structure?

Options:
A
B
C all of these
D

The correct answer is:

Solution:
Non superimposible mirror image of compound is
. so both are enantiomers

Topic: Chemistry, General Organic Chemistry, NEET
Which of the following is the energy of a possible excited state of hydrogen?

Options:
A + 6.8 eV
B + 13.6 eV
C - 6.8 eV
D - 3.4 eV

The correct answer is:
- 3.4 eV

Solution:
E n =−13.6× Z 2 n 2 eV Z=1   for  H.
E n = - 13.6 n 2 eV
Where n = 2 ⇒ E 2 = - 3.40 eV

Topic: Chemistry, Structure of Atom, NEET
Which of the following is the example of a polar covalent bond?

Options:
A H2
B O2
C N2
D HF

The correct answer is:
HF

Solution:
Correct Option is : (D)
HF

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Which of the following is the example of conditioned reflex?

Options:
A Hand withdraws when pierced with a needle
B Eyes closed, when anything enter into it
C During digestion food goes forward in alimentary canal
D Trained dog salivates when you ring a bell

The correct answer is:
Trained dog salivates when you ring a bell

Solution:
Trained dog salivates when you ring a bell is the example of conditioned reflex. It is also called acquired reflexes. It is not inborn but acquired and dependent on past experience, training and learning i.e., adopted during the course of a lifetime.

Topic: Biology, Neural Control and Coordination, NEET
Which of the following is the example of pleiotropic gene?

Options:
A Haemophilia
B Thalassemia
C Sickle cell anaemia
D Colour blindness

The correct answer is:
Sickle cell anaemia

Solution:
Sickle cell anaemia is an example of pleiotropic gene because here the mutation in the single gene carries out a number of changes throughout the body and affects the body in different ways.

Topic: Biology, Principles of Inheritance and Variation, NEET, NEET 2002
Which of the following is the example of sex-linked disease?

Options:
A AIDS
B Colour blindness
C Syphilis
D Gonorrhoea

The correct answer is:
Colour blindness

Solution:
Colour blindness is a inherited as sex-linked (X-linked) recessive traits. Usually, females are carriers and males are affected.
Related Theory
Colour blindness is a usually hereditary condition that means it is commonly passed down from our parents. Red/green colour blindness is passed from mother to son on the 23 rd chromosome that is called as the sex chromosome as it additionally determines sex.

Topic: Biology, Principles of Inheritance and Variation, NEET, NEET 2002
Which of the following is the first phase to occur in a sigmoid growth curve?

Options:
A Log Phase
B Lag Phase
C Exponential Phase
D Deceleration phase

The correct answer is:
Lag Phase

Solution:
A population growing in a habitat with limited resources show initially a lag phase, in which slow growth occurs followed by phases of acceleration and deceleration and finally asymptote, when the population density reaches the carrying capacity.

Topic: Biology, Organisms and Populations, NEET
Which of the following is the first popular artificial sweetening agent?

Options:
A Aspartame
B Saccharin
C Sucralose
D Alitame

The correct answer is:
Saccharin

Solution:
Correct Option is : 2
Saccharin

Topic: Chemistry, Chemistry in Everyday Life, NEET
Which of the following is the function of lymph?

Options:
A Transport oxygen to brain
B Transport carbon dioxide to lungs
C Return interstitial fluid back to the heart
D Contain RBC, leukocytes and more proteins as compared

The correct answer is:
Return interstitial fluid back to the heart

Solution:
Lymph is the fluid that circulates throughout the lymphatic system. The lymph is formed when the interstitial fluid is collected through lymph capillaries. It is then transported through lymph vessels to lymph nodes before emptying ultimately into the right or the left subclavian vein, where it mixes back with blood.

Topic: Biology, Body Fluids and Circulation, NEET
Which of the following is the highest oxidation state halide possible in the first row of transition metals?

Options:
A CrF6
B MnF6
C CrCl6
D MnCl6

The correct answer is:
CrF6

Solution:
Correct Option is : 1
CrF6

Topic: Chemistry, d and f Block Elements, NEET
Which of the following is the incorrect order of atomic radii of d-block elements?

Options:
A Ta>Nb>V
B W>Mo>Cr
C Ru>Os>Fe
D Ir>Rh>Co

The correct answer is:
Ru>Os>Fe

Solution:
Correct Option is : 3
Ru>Os>Fe

Topic: Chemistry, d and f Block Elements, NEET
Which of the following is the incorrect statement regarding animal tissue?

Options:
A Epithelial cells are compactly packed with little intercellular matrix.
B Tight junctions perform cementing to keep neighbouring cells together.
C Connective tissue ranges from very soft to very hard specialised types.
D Cell junctions hold smooth muscle fibres together and are covered by connective tissue sheath.

The correct answer is:
Tight junctions perform cementing to keep neighbouring cells together.

Solution:
Tight junctions help to stop substances from leaking across a tissue. These junctions are usually found in apical part of columnar epithelial cells.
Adhering junctions perform cementing to keep neighbouring cells together.

Topic: Biology, Structural Organisation in Animals, NEET
Which of the following is the intermediate compound linking glycolysis to the Krebs' cycle?

Options:
A Malic acid
B Acetyl CoA
C NADH
D ATP

The correct answer is:
Acetyl CoA

Solution:
During glycolysis pyruvic acid is produced from glucose and is oxidatively decarboxylated to form acetyl CoA . The oxidation of pyruvic acid occurs inside matrix of mitochondria and is called as link reaction. It results in production of 2 molecules of CO2 and 2 molecules of NADH2 . This acetyl CoA is completely oxidised during Krebs' cycle. Thus acetyl CoA acts as the linker of glycolysis and Krebs' cycle.

Topic: Biology, Respiration in Plants, NEET
Which of the following is the intermediate in the reduction of nitrobenzene

Options:
A C6H5N=O
B C6H5NH-NH-C6H5
C C6H5-N=N-C6H5
D

The correct answer is:
C6H5N=O

Solution:

Topic: Chemistry, Amines, NEET
Which of the following is the major application of nitrobenzene?

Options:
A Food preservative
B Explosives production
C Antiseptic
D Flavor enhancer

The correct answer is:
Explosives production

Solution:
Nitrobenzene is primarily used in the production of explosives and is not typically used as a food preservative, antiseptic, or flavor enhancer.

Topic: Chemistry, Hydrocarbons, NEET
Which of the following is the major solute species in a solution of lysine at pH = 10.5?

Options:
A
B
C
D

The correct answer is:

Solution:
pH = 10.5, it is greater than isoelectric pH of lysine, hence it will exist as anion 'D'.

Topic: Chemistry, Biomolecules, NEET
Which of the following is the mathematical statement of the first law of thermodynamics?

Options:
A ∆U = q + w
B q = w
C ∆U = 0
D None of the above

The correct answer is:
∆U = q + w

Solution:
The first law of thermodynamics states that the change in internal energy of a system is equal to the sum of the heat transferred to the system and the work done on the system. This is expressed mathematically as ∆U = q + w.

Topic: Chemistry, Thermodynamics (C), NEET
Which of the following is the methyl ester of dipeptide formed from aspartic acid and phenylalanine?

Options:
A Aspartame
B Saccharin
C Sucralose
D Alitame

The correct answer is:
Aspartame

Solution:
Correct Option is : 1
Aspartame

Topic: Chemistry, Chemistry in Everyday Life, NEET
Which of the following is the monomer of inulin?

Options:
A Fructose
B Amino acids
C Glucose
D Galactose

The correct answer is:
Fructose

Solution:
Inulin is fructan i.e. polymer of fructose.
Glycogen is stored food in animals, it is an homopolymer made up of glucose. It is multi branched polysaccharide in which glucose molecules are linked by alpha 1 - 4 glycosidic linkage and branches are linked by alpha 1 - 6 glycosidic linkage. It gives red colour with iodine solution.

Topic: Chemistry, Biomolecules, NEET
Which of the following is the monomer of teflon?

Options:
A Acrylonitrlile
B Styrene
C Ethene
D Tetrafluoroethene

The correct answer is:
Tetrafluoroethene

Solution:
Correct Option is : 4
Tetrafluoroethene

Topic: Chemistry, Polymers, NEET
Which of the following is the most basic oxide ?

Options:
A SeO2
B Al2O3
C Sb2O3
D Bi2O3

The correct answer is:
Bi2O3

Solution:
SeO 2 → acidic oxide
Al 2 O 3 → amphoteric
Sb 2 O 3 → amphoteric
Bi 2 O 3 → basic oxide

Topic: Chemistry, p Block Elements (Group 13 & 14), NEET
Which of the following is the most basic oxide?

Options:
A $\mathrm{SeO}_2$
B $\mathrm{Al}_2 \mathrm{O}_3$
C $\mathrm{Sb}_2 \mathrm{O}_3$
D $\mathrm{Bi}_2 \mathrm{O}_3$

The correct answer is:
$\mathrm{Bi}_2 \mathrm{O}_3$

Solution:
$\mathrm{Bi}_2 \mathrm{O}_3$ is the most basic oxide because of higher reactivity with acid.
$$
\mathrm{Bi}_2 \mathrm{O}_3+6 \mathrm{HCl} \rightarrow 2 \mathrm{BiCl}_3+3 \mathrm{H}_2 \mathrm{O}
$$
$\mathrm{Al}_2 \mathrm{O}_3$ and $\mathrm{Sb}_2 \mathrm{O}_3$ are amphoteric and $\mathrm{SeO}_2$ is acidic.

Topic: Chemistry, p Block Elements (Group 13 & 14), NEET, NEET 2006
Which of the following is the most common oxidation state of group 15 elements?

Options:
A -3
B +3
C +5
D +2

The correct answer is:
-3

Solution:
The paragraph states that all group 15 elements exhibit -3, +3, and +5 oxidation states, but the -3 oxidation state is the most common. This is because it is the most stable oxidation state for group 15 elements.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Which of the following is the most common respiratory substrate?

Options:
A Carbohydrates
B Proteins
C Fats
D All of the above

The correct answer is:
All of the above

Solution:
Carbohydrates, proteins, fats and organic acids are the most common respiratory substrate

Topic: Biology, Respiration in Plants, NEET
Which of the following is the most common use of morphine?

Options:
A Sedative and pain killer
B Hallucinogen.
C Depressant
D Anti depressant

The correct answer is:
Sedative and pain killer

Solution:
Morphine : Very effective sedative and painkiller in patients undergone surgery.
Heroin (or smack)
- It is a white, odourless and bitter crystalline compound.
- Chemically it is diacetylmorphine obtained by acetylation of morphine.
- It is extracted from the latex of poppy plant - Papaver somniferum.
- Usually taken by snorting and injection.
- Action : Heroin is a depressant thus slows down the body functions.

Topic: Biology, Human Health and Diseases, NEET
Which of the following is the most correct electron displacement for a nucleophile reaction to take place?

Options:
A
B
C
D

The correct answer is:

Solution:
Chlorine group is -I effect group, because Cl is more electronegative atom than carbon. so, electron transfers towards it.

Topic: Chemistry, General Organic Chemistry, NEET, NEET 2015 (Phase 1)
Which of the following is the most effective way to conserve plant diversity of an area?

Options:
A Tissue culture
B Botanical garden
C Biosphere reserves
D Seed banks

The correct answer is:
Biosphere reserves

Solution:
Biosphere reserves are multipurpose protected area which are meant for preserving genetic diversity in representative ecosystems of various natural biomes and unique biological communities.

Topic: Biology, Biodiversity and its Conservation, NEET
Which of the following is the most important cause for animals and plants being driven to extinction?

Options:
A Habitat loss and fragmentation
B Drought and floods
C Economic exploitation
D Alien species invasion

The correct answer is:
Habitat loss and fragmentation

Solution:
Destruction of Habitat – It is currently the biggest cause of current extinctions. Deforestation has killed off more species than we can count. Whole ecosystems live in our forests. It is predicted that all our rainforest can disappear in the next 100 years if we cannot stop deforestation.
Habitat fragmentation describes the emergence of discontinuities (fragmentation) in an organism's preferred environment (habitat), causing population fragmentation and ecosystem decay. Causes of habitat fragmentation include geological processes that slowly alter the layout of the physical environment (suspected of being one of the major causes of speciation),and human activity such as land conversion, which can alter the environment much faster and causes the extinction of many species.

Topic: Biology, Biodiversity and its Conservation, NEET, NEET 2019 (All India)
Which of the following is the most important monomer component of the chitinous exoskeleton of arthropods?

Options:
A N - acetyl glucosamine
B Taurocholic acid
C Hyaluronic acid
D D - glucosamine

The correct answer is:
N - acetyl glucosamine

Solution:
Chitin is a homopolymer present in the exoskeleton of arthropods and cell wall of fungi. It formed by the polymerization of amino sugar N - acetyl glucosamine. Amino sugars are modified sugar in which one OH group of sugar is replaced by amino group.

Topic: Chemistry, Biomolecules, NEET
Which of the following is the most preferred conformation of ethane molecule

Options:
A Staggered
B Skew
C Eclipsed
D None of the above

The correct answer is:
Staggered

Solution:
In ethane molecule three conformational isomers are present. Staggered form is most preferred while eclipsed is least one.

Topic: Chemistry, General Organic Chemistry, NEET
Which of the following is the most stable carbocation here?

Options:
A
B
C
D

The correct answer is:

Solution:
Here is the most stable carbocation due to maximum dancing resonance.

Topic: Chemistry, General Organic Chemistry, NEET
Which of the following is the most stable carbocation?

Options:
A

B

C

D

The correct answer is:

Solution:

Topic: Chemistry, General Organic Chemistry, NEET, NEET 2022 (Phase 2)
Which of the following is the most successful and widely used artificial sweetener?

Options:
A Aspartame
B Saccharin
C Sucralose
D Alitame

The correct answer is:
Aspartame

Solution:
Correct Option is : 1
Aspartame

Topic: Chemistry, Chemistry in Everyday Life, NEET
Which of the following is the natural plant growth hormone?

Options:
A Auxins
B Gibberellins
C Cytokinins
D All of the above

The correct answer is:
All of the above

Solution:
The natural plant growth hormones are Auxins, Gibberellins, Cytokinins, abscisic acid and ethylene.

Topic: Biology, Plant - Growth and Development, NEET
Which of the following is the odd one out?

Options:
A Mitochondria
B Chloroplast
C Bacteriophage
D Tobacco mosaic virus

The correct answer is:
Tobacco mosaic virus

Solution:
Mitochondria, chloroplast, bacteriophage have DNA as a part of them. Meanwhile, TMV and plant viruses have RNA as genetic material.

Topic: Chemistry, Biomolecules, NEET
Which of the following is the only vector quantity?

Options:
A Temperature
B Impulse
C Total path length
D Charge

The correct answer is:
Impulse

Solution:
Correct Option is : (B)
Impulse

Topic: Chemistry, Motion In Two Dimensions, NEET
Which of the following is the optimum speed for a race car, with a coefficient of friction of 0.2 between its wheels and the road, to avoid wear and tear on its tires while navigating a circular racetrack with a 300 m radius banked at an angle of 15°?

Options:
A 20 m/s
B 24 m/s
C 28.1 m/s
D 32.4 m/s

The correct answer is:
28.1 m/s

Solution:
Correct Option is : (C)
28.1 m/s

Topic: Chemistry, Laws of Motion, NEET
Which of the following is the orbital for l =2

Options:
A 3s
B 3p
C 3d
D none of the above

The correct answer is:
3d

Solution:
Correct Option is : 3
3d

Topic: Chemistry, Structure of Atom, NEET
Which of the following is the outer orbital electronic configuration of Mendelevium?

Options:
A 5f117s2
B 5f127s2
C 5f137s2
D 5f147s2

The correct answer is:
5f137s2

Solution:
Correct Option is : 3
5f137s2

Topic: Chemistry, d and f Block Elements, NEET
Which of the following is the outer orbital electronic configuration of Uranium?

Options:
A 5f36d17s2
B 5f46d17s2
C 5f36d27s2
D 5f67s2

The correct answer is:
5f36d17s2

Solution:
Correct Option is : 1
5f36d17s2

Topic: Chemistry, d and f Block Elements, NEET
Which of the following is the phase difference between the oscillatory motion at two points separated by a distance of λ/2 for the harmonic travelling wave y = 2 cos 2π(10t–0.0080x + 3.5), where x and y are in cm and t is in seconds?

Options:
A 0 radians
B π/2 radians
C π radians
D 3π/2 radians

The correct answer is:
π radians

Solution:
Correct Option is : (C)
π radians

Topic: Chemistry, Waves and Sound, NEET
Which of the following is the polymer of a nucleotide?

Options:
A Protein
B Lipid
C DNA
D Carbohydrate

The correct answer is:
DNA

Solution:
DNA is a polynucleotide.
Nucleotide = Nitrogenous base (a hetrocyclic compound) + Monosaccharide sugar (pentose type) + Phosphate.
Nucleoside = Nitrogenous base (a hetrocyclic compound) + Monosaccharide sugar (pentose type).
Nucleotide = Nucleoside + Phosphate.

Topic: Chemistry, Biomolecules, NEET
Which of the following is the Pribnow box?

Options:
A 5'TATAAT 3'
B 5' TAATTA 3'
C 5' AATAAT 3'
D 5' ATATTA 3'

The correct answer is:
5'TATAAT 3'

Solution:
Pribnow box is a short conserved (about 6 bp) sequence of promoter sites in prokaryotes. 5'TATAAT 3' sequence is available in almost all promoters, which lies at -10 sequence.

Topic: Biology, Molecular Basis of Inheritance, NEET
Which of the following is the primary lymphoid organ?

Options:
A Spleen
B Lymph nodes
C Thymus
D Peyer's patches

The correct answer is:
Thymus

Solution:
Thymus is the primary lymphoid organ

Topic: Biology, Human Health and Diseases, NEET