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: A flower produces *** that fall to the ground and *** into new plants that produce more flowers. The *** begin to *** by the process of  (A) fertilization. (B) germination. (C) maturation. (D) pollination.
E.

Question: What is the source of energy required to begin photosynthesis?  (A) Sunlight (B) Water (C) Starch (D) Chlorophyl.
A.

Question: Which of these is a nonliving part of a forest?  (A) Tree (B) Soil (C) Worm (D) Mushroo.

B.