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 female dog is having puppies. She has black fur, brown eyes, and a curly tail. She can sit, bark, and roll over on command. Which set of *** can the female dog's *** ***?  (A) brown eyes, black fur (B) fur, roll over on command (C) brown eyes, sit on command (D) bark on command, curly tai.

Ex Output:
A.


Ex Input:
Question: What is the smallest unit of an element that still has the properties of that element?  (A) an atom (B) a compound (C) an electron (D) a molecul.

Ex Output:
A.


Ex Input:
Question: Which part of the plant takes in water and nutrients?  (A) roots (B) stem (C) leaves (D) flowe.

Ex Output:

A.