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: building housing developments usually requires replacing animal habitats, Fact2: Habitat destruction is the primary cause of extinction or threat of extinction for all animals., Question: Building housing developments may cause  (A) eruptions (B) colder weather (C) disease (D) erosion (E) extinction (F) mutations (G) Destroy bridges (H) deforestation
[A]: E


[Q]: Fact1: Viruses cannot reproduce by themselves., Fact2: Viruses attach themselves to cells and reproduce., Question: How can viruses make copies of themselves? (A) A compound that donates proton (B) attach themselves to cells (C) have sex with another virus (D) distances themselves from cell (E) attach themselves to viruses (F) it needs them (G) rapid expansion (H) By wind and rain
[A]:
B