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: Freshwater biomes have water that contains little or no salt., Fact2: Biomes are global ecosystems., Question: what is freshwater habitats that contain little or no salt? (A) Animal survival (B) allow growth (C) weathering (D) atmosphere (E) loose soil (F) ecosystems (G) salt and water. (H) oceans
[EX A]: F

[EX Q]: Fact1: Most plants grow roots down into the soil to absorb water and minerals., Fact2: Beets and carrots are the roots of plants., Question: What grows into the soil to absorb water and minerals?  (A) NaCl (B) vegetation (C) burrs (D) Trees (E) grass (F) Carrots (G) Conifers (H) potatoes
[EX A]:
F