Teacher: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").
Teacher: Now, understand the problem? Solve this instance: 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) Cartilage (B) keratin (C) lamphreys (D) protection (E) bone (F) broken bones (G) weathering (H) water vapor
Student:
B