You will be given a definition of a task first, then some input of the task.
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").

Fact1: Air pollution harms the respiratory and circulatory systems., Fact2: Air pollution is caused by lots of different pollutants., Question: What systems are pollutants bad for? (A) destroying life (B) classification system (C) an organism's body (D) respiratory and circulatory (E) animal habitats (F) ambulatory systems (G) social security system (H) the environment
Output:
D