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: 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.


Input: Consider Input: Question: Electricity to play your radio can be made using renewable or nonrenewable resources. Which of the following resources are renewable?  (A) wind and oil (B) wind and sunlight (C) natural gas and oil (D) natural gas and coa?

Output: B.


Input: Consider Input: Question: In which environment would a white rabbit be best protected from predators?  (A) a shady forest (B) a snowy field (C) a grassy lawn (D) a muddy riverban?


Output: B.