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: In humans, the *** process begins in  (A) the intestine, with squeezing. (B) the mouth, with chewing and saliva. (C) the stomach, with churning and acid. (D) the esophagus, with pushing towards the stomach.
Example Output: B.

Example Input: Question: Which *** will occur in the *** of an *** *** that is working properly?  (A) The wire will become warmer. (B) The wire will lose some of its mass. (C) The wire will form an electric field. (D) The wire will develop a new crystal structure.
Example Output: E.

Example Input: Question: Gordon reads that if an object is *** to the *** of a ***, then the force of *** will be stronger. According to this information, where would the force of *** be the ***?  (A) in a flying airplane (B) on a tall mountain (C) in a deep valley (D) on an islan.
Example Output:
E.