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").
Q: Fact1: disease-causing microbes have a negative impact on the body, Fact2: Pathogens are microbes that cause disease., Question: what has a negative impact on the body? (A) pathogens (B) electrons (C) smallpox (D) amoebae (E) vitamins (F) lungs (G) viruses (H) smoking
A:
A