In this task, you are given a multiple-choice question and you have to pick the correct option. Answer with option indexes (i.e., "A", "B", "C", and "D").

Example Input: which of these conditions might lead to the inability to move one's bones? (A) the absence of blood platelets (B) an absence of vitamin C (C) muscular wasting might be present (D) a shortage of white blood cells
Example Output: C

Example Input: In a bowl of water with the sun shining on it, what happens to the water after four hours? (A) the water is growing algae (B) there is less water (C) the water is dirty (D) there is more water
Example Output: B

Example Input: What do rotating vanes on an electric fan do to air? (A) dampen (B) circulate (C) cool (D) warm
Example Output:
B