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'.

Example Input: Question: *** invention *** *** telescope allowed *** *** *** following *** take place?  (A) the discovery of cells (B) the identification of weather patterns (C) detailed observation of planets (D) communication between distant citie.
Example Output: C.

Example Input: Question: In the forest, one type of tree produces special seeds. These seeds start to grow only after going through a fire. In the fire, the adult trees are destroyed. Which ***, needed for growth, are now available to the newly growing seeds?  (A) sunlight and wind (B) sunlight and space (C) soil and pollen producers (D) pollen producers and spac.
Example Output: B.

Example Input: Question: *** effect *** lack *** *** disease*** *** predators *** *** *** ***  (A) They increase the mutations in a population. (B) They prevent a population from becoming extinct. (C) They increase the rate of population growth. (D) They can limit the growth of the population.
Example Output:
E.