instruction:
In this task, you are given a multiple-choice question and you have to pick the correct option. Answer with option indexes (i.e., "A", "B", "C", and "D").
question:
If a fish lives in water that is very dark, the fish may calibrate its body over time to (A) absorb helium (B) turn invisible (C) eat more (D) be blind
answer:
D


question:
When observing animals in the wild, which of these are you most likely to see? (A) A frog stalking a rabbit (B) A bear sticking its claws in the river (C) A wolf hunting an eagle (D) A tiger hunting a dolphin
answer:
B


question:
The field a farmer plants with varied crops over the years is richer than (A) a field where apples, beans and squash is planted (B) a field where only grain is planted (C) a field where rice, corn and beans are planted (D) a field where fruits and vegetables are planted
answer:

B