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: completing a circuit causes electricity to flow through that circuit, Fact2: When electric current is flowing, power is produced., Question: Power is produced when what happens? (A) circuit is opened (B) circuit is broken (C) heating liquids (D) forest is destroyed (E) circuit is burned out (F) circuit is completed (G) heat energy (H) chemical reaction
Output:
F