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: acid rain has a negative impact on water quality, Fact2: Sulfur dioxide causes acid rain., Question: Water quality can be negatively effected by what? (A) flooding (B) Pesticides (C) erosion (D) contamination (E) competition (F) Pollution (G) sulfur dioxide (H) deforestation
Output:
G