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: *** *** *** *** *** *** prevent infections *** *** *** *** cuts *** scrapes?  (A) apply a cold ice pack (B) raise the injured area (C) apply pressure to stop bleeding (D) wash the area with warm, soapy wate.
Example Output: D.

Example Input: Question: Organisms that break down dead tissues are called __________.  (A) carnivores (B) decomposers (C) herbivores (D) producer.
Example Output: B.

Example Input: Question: What is an advantage of competition?  (A) It is a natural way to separate the strong from the weak. (B) It always results in adaptations. (C) It decreases the size of strong populations. (D) Competition is selfish and has no advantages.
Example Output:
A.