In this subtask, you will answer a simple science question. Please indicate the correct answer. If you're not sure about the answer, choose the last option "I don't know". Do not generate anything else apart from one of the following characters: 'A', 'B, 'C', 'D', 'E'. The "A"-"D" responses correspond to the answer options mentioned in the input. There is a 5th option "E" which should be used for questions for which you're not sure about the answer (e.g., when the questions do not provide enough information to answer).

Input: Consider Input: Question: When a guitar string is plucked, sound is produced by  (A) the size of the guitar. (B) the metal on the guitar. (C) the wood on the guitar. (D) the vibrations of the string?

Output: D.


Input: Consider Input: Question: Organisms that break down dead tissues are called __________.  (A) carnivores (B) decomposers (C) herbivores (D) producer?

Output: B.


Input: Consider Input: Question: Living things need which of the following to survive?  (A) food and electricity (B) air, food, and shelter (C) water, food, and clothes (D) food, water, and ai?


Output: D.