Detailed 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").
Problem:Fact1: Air pollution harms the respiratory and circulatory systems., Fact2: Dust contributes to air pollution., Question: What harms the respiratory and circulatory systems? (A) oil (B) Cars (C) coal (D) water (E) air (F) sulfur (G) bees (H) dust
Solution:
H