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) Both make wood. (B) Both have roots. (C) Both need moonlight. (D) Both have short lives.

Ex Output:
E.


Ex Input:
Question: New engine *** has helped cars get more *** per gallon of gas. Since gasoline comes from oil, this *** will affect the world *** of oil by  (A) increasing the need to search for more oil. (B) reducing the time it takes for oil to be renewed. (C) decreasing the amount of oil that exists underground. (D) extending the time that oil will be available for people to use.

Ex Output:
D.


Ex Input:
Question: *** precaution must *** taken *** students *** making observations *** *** Sun?  (A) Use only new equipment. (B) Use a very strong telescope. (C) Project image onto a piece of cardboard. (D) Look at the Sun only in the morning.

Ex Output:

C.