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: Cars and trucks emit tremendous amounts of airborne pollutants, which increase acid rain., Question: Which of the following has the worst effect on water quality? (A) bacteria (B) Pesticides (C) fossil fuels (D) deforestation (E) cars and trucks (F) humans disturb it (G) flooding (H) Destroy bridges
Output:
E