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: How does the length of daylight in New York State change from summer to fall?  (A) It decreases.(B) It increases.(C) It remains the same.

Ex Output:
A.


Ex Input:
Question: Which *** help to destroy pathogens such as bacteria that enter the human body?  (A) red blood cells (B) liver cells (C) white blood cells (D) brain cell.

Ex Output:
C.


Ex Input:
Question: James and Jordan roll their *** across the carpeted living room floor. They notice that they are *** moving as fast as they had when they played on the tiled kitchen floor. Which *** is responsible for *** down the cars?  (A) Wind (B) Gravity (C) Thrust (D) Frictio.

Ex Output:

D.