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: coal is used for generating heat by burning, Fact2: Thus, the food is cooked by heat generated internally., Question: What can be used to cook food? (A) war (B) bacon (C) breeding (D) coal (E) bees (F) energy (G) sugar (H) oil
A:
D