instruction:
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").
question:
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
answer:
F


question:
Fact1: planting trees has a positive impact on an ecosystem, Fact2: An ecosystem contains many habitats., Question: doing what with trees has a positive impact on habitats (A) making tables (B) chopping down (C) planting (D) watershed (E) earth (F) bloom time (G) growth (H) timbering
answer:
C


question:
Fact1: Antibodies are large, Y-shaped proteins that recognize and bind to antigens., Fact2: Some of the antibodies, antophospholipid antibodies, cause blood clots., Question: some proteins do what to antigens to cause blood clots (A) edema (B) Toxins (C) H 2 O (D) bind (E) work (F) fusion (G) HIV (H) damage
answer:

D