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 Q]: Question: Mount St. Helens is part of a volcanic chain that slowly formed on Earth where __________.  (A) continental plates collided (B) oceanic plates pulled apart (C) a continental and an oceanic plate pulled apart (D) a continental and an oceanic plate collide?
[EX A]: D.

[EX Q]: Question: What is the primary energy source that drives all weather events, including precipitation, hurricanes, and tornados?  (A) the Sun (B) the Moon (C) Earth's gravity (D) Earth's rotatio?
[EX A]: A.

[EX Q]: Question: The functions of a plant's roots are to support the plant and  (A) make food (B) produce fruit (C) take in water and nutrients (D) aid in germination?
[EX A]:
C.