You are presented with the quiz "Weigh lifting requires muscles" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "muscle contraction occurs when muscle fibers get shorter" and "isometric exercise is a sustained contraction of large muscles, such as weight lifting". So, what's the best answer to the question?

OPTIONS:
- to move people
- Energy.
- stamina
- it needs them
- shortening
- hydration
- sensory neurons
- Energy

Answer: shortening
Problem: OPTIONS:
- feet
- speed
- size
- bills
- Limbs
- beaks
- wings
- Tail
Q: You are presented with the quiz "ducks can move fast through the water due to their specialized what" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "webbed feet are used for moving faster through water by aquatic animals" and "all ducks have webbed feet". So, what's the best answer to the question?
Answer: feet
Problem:OPTIONS:
- hair and skin
- sensory neurons
- an organism's body
- animals
- volume and plants
- gravity and clouds
- density and humans
- Veins and arteries.

You are presented with the quiz "what shares some of the same structures and basic functions?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "all cells share some of the same structures and basic functions" and "hair cells are also a type of skin cell". So, what's the best answer to the question?
****
A: hair and skin
You are presented with the quiz "What negatively affects plant life?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "darkness has a negative impact on photosynthesis" and "plants use photosynthesis to make food". So, what's the best answer to the question?
OPTIONS:
- toxins
- darkness
- fertilizer
- water
- Pesticides
- Smoking
- Pollution
- sunlight
darkness
You are presented with the quiz "chromosomes contain what" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "chromosomes contain genes, which code for proteins" and "genes are arranged in gene clusters". So, what's the best answer to the question?
OPTIONS:
- all matter
- spectrum
- Energy.
- adrenaline
- nerve cells
- clusters
- Energy
- skin cells

Answer: clusters
input with options: You are presented with the quiz "What organs do both fishes and reptiles have?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "fish have a centralized nervous system with a brain" and "nervous A reptile has a brain and nervous system". So, what's the best answer to the question?
OPTIONS:
- legs
- they all walk on land
- gills
- the eyes
- protected
- brains
- alveoli
- vision
output:
brains