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'.

Ex Input:
Question: The systems of the human body work together. Which *** works with the *** *** by pulling on the bones to create ***?  (A) digestive (B) circulatory (C) muscular (D) nervou.

Ex Output:
C.


Ex Input:
Question: During which *** of the year would a ***'s *** be ***?  (A) summer (B) spring (C) winter (D) fal.

Ex Output:
E.


Ex Input:
Question: Some objects are attracted by magnets. Which object is attracted by a magnet?  (A) an iron nail (B) an ice cube (C) a plastic knife (D) a wooden rule.

Ex Output:

A.