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: People have fingernails., Question: who can prevent injury by forming protective plates over the ends of the fingers? (A) lamphreys (B) keratin (C) Cartilage (D) butterflies (E) ants (F) people (G) neurones (H) snakes
A:
F