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).

Q: 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?

A: A.
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Q: Question: The Earth's rotation on its axis causes ___.  (A) the duration of a year (B) climate change (C) seasons (D) day and nigh?

A: D.
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Q: Question: Some birds fly south before winter each year. This is an example of  (A) migration (B) hibernation (C) germination (D) evaporation?

A:
A.
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