In this task, you are given a question and answer options for that question. Using this information, you have to classify each text into different topics: medicine, nursery, psychology, chemistry, pharmacology, biology.

Q: Question: The gas used to generate the ICP plasma (coupled induction plasma) is: 
 Options:  <0> Hydrogen for being diatomic, chemically inert and with a low ionization energy. <1> Oxygen because it is diatomic, highly reactive and with a high ionization energy. <2> Argon, being monatomic, chemically inert and with a high ionization energy. <3> Xenon, being monatomic, highly reactive and with a low ionization energy. <4> None of the above is correct, because the gas used is helium.

A: chemistry
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Q: Question: Among the following, the first precursor cell of neutrophil granulocytes is: 
 Options:  <0> Monoblast. <1> Myeloblast. <2> Metamielocito. <3> Cell in band (or in staff) <4> Promyelocyte

A: biology
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Q: Question: If after 200 microliters of a 10-4 dilution (10 exp. -4) of a broth on an agar plate grows 100 colonies, the estimated number of colony forming units per mL of broth is: 
 Options:  <0> 0.2 x 104 <1> 2 x 106 <2> 5 x 104 <3> 5 x 105 <4> 5 x 106

A:
biology
****