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'.

Input: Consider Input: Question: Which *** of a *** is an *** *** *** to *** ***?  (A) cleaning its ears (B) sleeping on a chair (C) sharpening its claws (D) meowing when it is hungr.

Output: E.


Input: Consider Input: Question: Tyrone put two *** in a plastic bottle of water and shook it. After he stopped shaking the bottle, he observed that small pieces of the *** were floating in the water. What is the best *** he can make based on this observation? If shaking the bottle causes pieces of *** to *** off, ___.  (A) then using cold water will break off more pieces (B) then using hot water will make the stones change colors (C) then shaking for a longer amount of time will break off more pieces (D) then shaking for a shorter amount of time will make the rocks change color.

Output: C.


Input: Consider Input: Question: Which of the following is the main *** of *** found on most flowering ***?  (A) to take in air (B) to produce seeds (C) to absorb nutrients (D) to protect the ste.


Output: E.