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: 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
[A]: D

[Q]: Fact1: pathogens can cause disease, Fact2: Fungi are significant pathogens., Question: What can fungi do? (A) protect them (B) survive (C) Spread disease (D) migrate (E) hydrate their cells (F) decrease stamina (G) reproduce (H) aerobic capacity
[A]: C

[Q]: Fact1: sound can be used for communication by animals, Fact2: Sounds are vibrations in air., Question: Vibrations in air can be used for what by animals? (A) activation energy (B) communication (C) Something to move (D) sleeping (E) sustenance (F) Heart rate (G) food and shelter (H) tasting
[A]:
B