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: acid rain has a negative impact on water quality, Fact2: Sulfur dioxide causes acid rain., Question: What has a negative impact on water quality? (A) Reverse osmosis (B) fossil fuels (C) Fresh water (D) Carbon filter (E) chlorofluorocarbons (F) Sulfur dioxide (G) Pollution (H) harmful substances

A: F
****
Q: Fact1: preventing the transfer of heat from an organims 's body causes that organism to keep warm, Fact2: Body heat is trapped in the haircoat., Question: The haircoat of a dog is useful for (A) recovery time from fatigue (B) When it's cold (C) protect them (D) finding bones (E) preventing dog days (F) keeping the dog warm (G) keeping the dog cool (H) water conservation

A: F
****
Q: Fact1: fire converts chemical energy into light and heat energy, Fact2: And since infrared energy is heat, it warms the Earth., Question: What converts chemical energy into light and warmth for earth? (A) tulips (B) wind (C) algae (D) trees (E) earth (F) fire (G) water (H) Green

A:
F
****