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: On a hiking *** to Big *** National ***, a *** found a *** ***. The *** would like to *** the *** of the ***. Which *** would be used to *** the *** of the ***?  (A) Incline plane (B) Balance (C) Meter stick (D) Graduated cylinde.
Example Output: E.

Example Input: Question: *** *** are *** from *** *** in a *** center. Which of the *** is the *** *** the *** *** *** *** the *** *** from the *** cans?  (A) sort the cans by size (B) put the cans in water (C) cool the cans to a low temperature (D) put the cans under an electromagne.
Example Output: E.

Example Input: Question: A *** of *** *** *** *** to the *** *** on a *** *** and *** the *** of their *** at *** AM, at ***, and at *** ***. To *** and *** the *** from their ***, they *** a ___.  (A) thermometer and balance (B) clock and measuring tape (C) clock and calculator (D) clock and thermomete.
Example Output:
E.