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: Muscles can only contract., Fact2: Muscles in the upper arm called biceps are used to flex the arm., Question: what can only contract? (A) nerves (B) Epidermis (C) the skin (D) strong (E) biceps (F) Bend (G) lungs (H) forces
A:
E