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).

Ex 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?

Ex Output:
B.


Ex Input:
Question: Which of the following is an example of a chemical change?  (A) clouds forming (B) sugar dissolving (C) water freezing (D) a candle burnin?

Ex Output:
D.


Ex Input:
Question: When the oven door is opened halfway through baking a cake, what is most likely to decrease?  (A) the cooking time (B) the cake's size (C) the amount of calories (D) the temperature in the ove?

Ex Output:

D.