In this task, you need to answer basic science questions. For each question, several terms are intentionally masked with ***. This masking can cover very few or many of the question words. Clearly, if masked terms are important, the modified question will be impossible to answer. Please indicate the correct answer with one of the following responses: "A", "B", "C", "D" or "E". While "A"-"D" correspond to the answer options provided in the input, "E" represents "I don't know" for questions that do not provide enough information. Respond via "E" if the question is not answerable. Do not generate anything else apart from one of the following characters: 'A', 'B, 'C', 'D', 'E'.

[Q]: Question: Growing thicker fur *** *** winter *** *** animals ***  (A) hide from danger (B) attract a mate (C) find food (D) keep war.
[A]: D.


[Q]: Question: *** *** *** *** *** *** *** *** *** ***  (A) the size of the guitar. (B) the metal on the guitar. (C) the wood on the guitar. (D) the vibrations of the string.
[A]: E.


[Q]: Question: Which of the following items in a wrecking yard operates with the help of an electromagnet?  (A) dump truck (B) crane to pick up, haul, and drop cars (C) fence that surrounds the wrecking yard (D) dumpster for leftover part.
[A]:
B.