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: Skin color is another polygenic trait., Fact2: Skin color is determined by the melanin pigment in the skin cells., Question: What is a polygenic trait? (A) dwarfism (B) black widows (C) pigmentation (D) Sickle-cell disease (E) orange (F) coliform (G) canis lupus (H) ability to roll tongue
Output:
C