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'.

[EX Q]: Question: *** material *** *** *** natural resource *** use *** making water-resistant shoes?  (A) cotton (B) leather (C) plastic (D) woo.
[EX A]: B.

[EX Q]: Question: *** *** *** *** enables *** animal *** *** oxygen?  (A) Digestive System (B) Cirulatory System (C) Respiratory System (D) Nervous Syste.
[EX A]: C.

[EX Q]: Question: An *** *** is placed in a pan. The *** is placed over an *** ***. Which *** will most likely happen over ***?  (A) The ice changes to a liquid and back to a solid. (B) The ice changes to a liquid then to a gas. (C) The ice changes to a gas and back to a solid. (D) The ice changes to a gas then to a liquid.
[EX A]:
B.