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).

[Q]: Question: The movement of the Earth in its orbit around the Sun is the Earth's ___.  (A) rotation (B) revolution (C) evolution (D) til?
[A]: B.


[Q]: Question: The invention of the telescope allowed which of the following to take place?  (A) the discovery of cells (B) the identification of weather patterns (C) detailed observation of planets (D) communication between distant citie?
[A]: C.


[Q]: Question: The largest body in our solar system is  (A) Earth. (B) the Sun. (C) Jupiter. (D) the Moon?
[A]:
B.