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: A *** *** *** *** it *** *** that are *** on ***. This *** can be *** a(an)  (A) adaptation. (B) difficulty. (C) camouflage. (D) migration.

Output: E.


Input: Consider Input: Question: *** *** source *** almost all heat energy *** Earth come?  (A) Wind (B) Water (C) The Sun (D) The Moo.

Output: C.


Input: Consider Input: Question: *** *** *** *** *** *** chemical reaction?  (A) a sugar cube dissolving in water. (B) ice cubes forming in a freezer. (C) ice cream melting in a bowl. (D) a cake baking in an oven.


Output: D.