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").

[EX Q]: Fact1: Mammals can also generate little bursts of heat by shivering., Fact2: Polar bears are mammals., Question: What can generate little bursts of heat by shivering? (A) alpacas (B) bacteria (C) animals (D) polar bears (E) phytoplankton (F) rabbit (G) viruses (H) humans
[EX A]: D

[EX Q]: 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
[EX A]: C

[EX Q]: Fact1: Hair is a fiber that is found only in mammals., Fact2: Bats have hair like all mammals so they can stay warm., Question: What keeps mammals warm? (A) fibers (B) eyeballs (C) white blood cells (D) fur (E) the skin (F) sweating (G) nostrils (H) heat
[EX A]:
A