Detailed Instructions: 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").
Q: Fact1: Fingernails prevent injury by forming protective plates over the ends of the fingers., Fact2: Fingernails are also made of keratin., Question: What prevents injury by forming protective plates over the ends of the fingers? (A) bone (B) vorticella (C) keratin (D) protection (E) lamphreys (F) Cartilage (G) skin (H) water
A:
C