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: A *** is modeling the *** between a *** *** and a *** organism. Which *** is a *** of a *** organism?  (A) a student passing out water to a group (B) a student getting cereal from the cabinet (C) two students collecting trash from a group (D) four students working together to move a des.
[EX A]: E.

[EX Q]: Question: In humans, the *** process begins in  (A) the intestine, with squeezing. (B) the mouth, with chewing and saliva. (C) the stomach, with churning and acid. (D) the esophagus, with pushing towards the stomach.
[EX A]: B.

[EX Q]: Question: Tyrone put *** *** in a *** *** of *** and *** ***. After he *** *** the bottle, he observed that *** *** of the *** were *** in the water. What is the *** *** he can make *** on this ***? If *** the *** *** *** of *** to *** off, ___.  (A) then using cold water will break off more pieces (B) then using hot water will make the stones change colors (C) then shaking for a longer amount of time will break off more pieces (D) then shaking for a shorter amount of time will make the rocks change color.
[EX A]:
E.