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'.

Question: How can we *** the *** compositon of ***?  (A) cause it to rust (B) cause it to melt (C) cut it into pieces (D) expose it to a magne.
E.

Question: In humans, the digestion 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.
B.

Question: The *** of one *** and the *** of another are necessary to form ***. Which one of the following *** *** *** to the egg?  (A) Sunlight (B) A butterfly (C) A leaf (D) The stigm.

E.