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: Helpful Generalizations Vapors and gases are molecules., Question: What from burning coal and oil dissolving in water in the atmosphere causes acid rain? (A) toxins (B) Pollution (C) excretion (D) chemicals (E) citric acid (F) bleach (G) vapors (H) water
Output:
G