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: Roundworms may be free-living or parasitic., Fact2: Roundworms make up the roundworm phylum, Nematoda., Question: What can the phylum Nematoda be? (A) dangerous (B) parasitic (C) horses (D) meiosis (E) more abundant (F) graptolites (G) homogenous (H) phytoplankton
[A]: B


[Q]: Fact1: gravity causes objects that have mass to be pulled down on a planet, Fact2: Rocks have mass., Question: What does gravity cause to be pulled down on a planet? (A) matter (B) heat (C) earth (D) solutes (E) oceans (F) Rocks (G) people (H) Lift
[A]: F


[Q]: Fact1: riding a bike does not cause pollution, Fact2: Carbon monoxide is, of course, an air pollutant., Question: what doesn't riding a bike cause? (A) Allergies (B) harmful substances (C) Decrease bodily water (D) Greenhouse gasses (E) carbon monoxide (F) global warming (G) Dehydration (H) chemical changes
[A]:
E