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: coal is used to produce electricity by burning in coal-fire power stations, Fact2: Heat is essential to the burning process., Question: How does coal produce electricity? (A) It remains dormant (B) It gets cooled (C) By rubbing together (D) chemical reaction (E) It gets heated up (F) major threat to health (G) Through magnetism (H) heat energy
Output:
E