Q: 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").
Fact1: Fingernails prevent injury by forming protective plates over the ends of the fingers., Fact2: Fingernails are also made of keratin., Question: Protective plates over the ends of the fingers are made of what? (A) keratin (B) tissue (C) a metal (D) bone (E) iron oxide (F) tiny hairs (G) antigens (H) Cartilage
A:
A