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).

Example Input: Question: When liquid water freezes, it forms ice. What is the physical state of an ice cube?  (A) gas (B) solid (C) liquid (D) plasm?
Example Output: B.

Example Input: Question: A student wants to measure the weight of a tomato from her garden. What tool should she use?  (A) balance (B) ruler (C) magnet (D) thermomete?
Example Output: A.

Example Input: Question: How does the length of daylight in New York State change from summer to fall?  (A) It decreases.(B) It increases.(C) It remains the same.?
Example Output:
A.