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: pollutants have a negative impact on the environment, Fact2: Cars are heavy polluters of the environment., Question: What has a negative impact on the environment? (A) Acids (B) bikes (C) cars (D) birds (E) mines (F) skates (G) wind (H) guns
Output:
C