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 Input:
Question: A manufacturer wants to produce a *** for *** *** that does not *** easily and is ***, ***, and ***. Which of the following is the *** *** to use to make the container?  (A) glass (B) metal (C) paper (D) plasti.

Ex Output:
E.


Ex Input:
Question: *** ***. *** is part of a *** *** that slowly *** on *** where __________.  (A) continental plates collided (B) oceanic plates pulled apart (C) a continental and an oceanic plate pulled apart (D) a continental and an oceanic plate collide.

Ex Output:
E.


Ex Input:
Question: How can we change the chemical compositon of iron?  (A) cause it to rust (B) cause it to melt (C) cut it into pieces (D) expose it to a magne.

Ex Output:

A.