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: do all insects have to undergo every stage of change before becoming full grown? (A) all of these (B) insects are born live (C) pupa stage is sometimes skipped (D) pupa is a required stage
Example Output: C

Example Input: The national symbol for the US would most likely eat (A) roaches (B) birds (C) mosquitoes (D) salmon
Example Output: D

Example Input: What could be an example of a thermal conductor (A) a penny (B) grass (C) a wood block (D) cotton
Example Output:
A