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 pollutants are inhaled., Question: What system does inhaled pollution harm? (A) health (B) humans (C) the environment (D) circulatory (E) people (F) bones (G) lymphatic (H) cell wall
D