Definition: 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").
Input: Fact1: Balance is the ability to sense and maintain body position., Fact2: Body position is critical., Question: What is critical? (A) Balance (B) oxygen (C) recovery (D) Electrical (E) heat (F) sun's heat (G) stay warm (H) stamina
Output:
A