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: A skill some humans have is (A) ten fingers (B) vision (C) heart beating (D) talking
Example Output: D

Example Input: Which of the following is correct? (A) The earth's strong gravitational pull causes a waxing gibbous to form (B) astrology causes a waxing gibbous to form (C) star maps cause a waxing gibbous to form (D) government satellites cause a waxing gibbous to form
Example Output: A

Example Input: Which of the following results from a chemical reaction involving baking soda? (A) Mixing play-doh (B) Making cereal (C) A dog's saliva (D) Science fair volcanoes
Example Output:
D