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: 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
[A]: D


[Q]: Fact1: Courtship is behavior that is intended to attract a mate., Fact2: Complex courtship rituals precede mating., Question: What are behavior that is intended to attract a mate? (A) a doorbell (B) firm hugs (C) Complex rituals (D) Riding a bike (E) Behaviour modifications (F) Magnets (G) honeybees (H) Friendship
[A]: C


[Q]: Fact1: Producers are organisms that produce food for themselves and other organisms., Fact2: Green plants are producers ., Question: what makes food for themselves and other organisms? (A) bacteria (B) chicken (C) green plants (D) plants (E) agriculture (F) humans (G) honeybees (H) Conifers
[A]:
C