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").
Input: Fact1: pushing on the pedals of a bike cause that bike to move, Fact2: First, overcoming inertia to move forward is difficult., Question: What must be overcome when pushing on bike pedals? (A) hormones (B) Pollution (C) heat (D) activity (E) animation (F) inertia (G) friction (H) energy
Output:
F