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: gases from burning coal and oil dissolving in water in the atmosphere causes acid rain, Fact2: Coal-fired power plants contribute to acid rain., Question: what can power plants cause? (A) Pesticides (B) wind (C) heat energy (D) acid rain (E) friction (F) Pollution (G) coal (H) oil
Output:
D