instruction:
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'.
question:
Question: A *** on top of a *** is *** at *** *** *** in ***. *** *** ***, in ***, the *** is *** again and is *** *** *** high. What *** *** *** the *** for the *** *** in ***?  (A) weathering (B) wind erosion (C) water erosion (D) chemical erosio.
answer:
E.


question:
Question: Which system is responsible for getting *** of *** *** and ***?  (A) digestive (B) urinary (C) locomotion (D) circulator.
answer:
E.


question:
Question: A caterpillar is relying on a producer as a source of food. Which of the following is a producer that a caterpillar would most likely use?  (A) leaves on a tree (B) cocoons (C) birds in a nest (D) sunlight in the sk.
answer:

A.