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 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.

Ex Output:
E.


Ex Input:
Question: *** and *** are necessary for ____ to ***.  (A) plants (B) animals (C) both plants and animals (D) nonliving thing.

Ex Output:
E.


Ex Input:
Question: Samuel investigated the effect of temperature on the growth of snapdragons. He recorded the results from the investigation and found that snapdragons do not grow well in low temperatures. What is the *** of this conclusion in the *** ***?  (A) It helps to organize the data. (B) It helps to evaluate the hypothesis. (C) It helps to prepare for an investigation. (D) It helps to collect information from observations.

Ex Output:

E.