Definition: In this task, you are given two facts, and a multiple-choice question. Based on the given facts, answer the question with index of the correct option (e.g, "A").
Input: Fact1: Mutations may change the structure of a chromosome or just change a single nucleotide., Fact2: Most mutations are beneficial to the organism., Question: Changing the structure of a chromosome can be what to an organsim? (A) massive damage (B) mechanical (C) beneficial (D) harm them (E) negative (F) dangerous (G) homogenous (H) Damages them
Output:
C