instruction:
In this subtask, you will answer a simple science question. Please indicate the correct answer. If you're not sure about the answer, choose the last option "I don't know". Do not generate anything else apart from one of the following characters: 'A', 'B, 'C', 'D', 'E'. The "A"-"D" responses correspond to the answer options mentioned in the input. There is a 5th option "E" which should be used for questions for which you're not sure about the answer (e.g., when the questions do not provide enough information to answer).
question:
Question: Which would be the best tool to measure the volume of a rock?  (A) Meter stick (B) Empty graduated cylinder (C) Graduated cylinder with water (D) Triple beam balanc?
answer:
C.


question:
Question: Which of the following enables an animal to get oxygen?  (A) Digestive System (B) Cirulatory System (C) Respiratory System (D) Nervous Syste?
answer:
C.


question:
Question: Bears growing fur in winter is an example of  (A) growth (B) adaptation (C) migration (D) variatio?
answer:

B.