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: Mollusks live in most terrestrial, freshwater, and marine habitats., Fact2: Though most trout are freshwater fish, some live in marine waters., Question: What do some mollusks live near? (A) gills (B) rivers (C) desert (D) roads (E) fungi (F) trout (G) clouds (H) water

A: F
****
Q: Fact1: gases released during the use of fossil fuels causes global warming, Fact2: Oil is a fossil fuel., Question: Gases released during the use of oil causes what? (A) global warming (B) better weather on the earth (C) colder weather (D) less oily air (E) The atmosphere (F) flooding (G) Temperature (H) cleaner air to breathe

A: A
****
Q: Fact1: stalactites are formed by deposition, Fact2: Inside the caves are some young stalactites and stalagmites in formation., Question: what causes formations in caves (A) Water expanding (B) calcite (C) oxygen (D) erosion (E) nitrogen (F) deposition (G) less water (H) carbon dioxide

A:
F
****