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: Birds evolved from a group of bipedal dinosaurs called theropods., Fact2: Bird's feathers have evolved from reptile scales., Question: what have evolved from reptile scales of bipedal dinosaurs called theropods (A) animals (B) fur (C) feathers (D) fur and fat (E) mammals (F) warm-blooded (G) hair (H) eyes
Output:
C