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).

Input: Consider Input: Question: Growing thicker fur in the winter helps some animals to  (A) hide from danger (B) attract a mate (C) find food (D) keep war?

Output: D.


Input: Consider Input: Question: What do plants use as input for photosynthesis?  (A) carbon dioxide (B) oxygen (C) minerals (D) nitroge?

Output: A.


Input: Consider Input: Question: Which of these objects is translucent?  (A) A student's notebook (B) A mirror on the bus (C) A brick wall of the school (D) A student's sunglass lense?


Output: D.