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").

[EX Q]: Fact1: Air pollution harms the respiratory and circulatory systems., Fact2: Cars are a significant source of air pollution., Question: What harms the respiratory and circulatory systems? (A) oil (B) rain (C) sulfur (D) cars (E) tires (F) coal (G) tar (H) bicycles
[EX A]: D

[EX Q]: Fact1: a plant requires sunlight to grow, Fact2: During the day, sunlight warms the soil., Question: When do plants grow the most? (A) week days (B) during the day (C) during winter days (D) bloom time (E) one celled organisms (F) by indirect light (G) in the morning (H) in the autumn season
[EX A]: B

[EX Q]: Fact1: Some parasites live on the surface of their host., Fact2: Fleas and ticks are parasites., Question: what sometimes lives on the surface of their host? (A) lungs (B) an organism's body (C) human (D) barnacles (E) fleas and ticks (F) density (G) sensory neurons (H) bacteria
[EX A]:
E