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'.

Example Input: Question: *** simple machine *** helps move *** flag *** *** flagpole ***  (A) a bar magnet (B) an inclined plane (C) a pulley (D) a leve.
Example Output: C.

Example Input: Question: *** *** *** *** *** *** *** *** *** *** ***?  (A) Taste and smell (B) Touch and sight (C) Sight and hearing (D) Smell and hearin.
Example Output: E.

Example Input: Question: John was using his mp3 player when it suddenly stopped working. What is the first thing John should do to try correcting the problem?  (A) recharge the battery (B) take the player apart (C) replace the player with a new one (D) change to a different son.
Example Output:
A.