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: natural disasters can cause animals to leave an environment, Fact2: And like fire, flooding is a common and widespread natural disaster., Question: What can cause animals to leave their environment? (A) predators (B) rainfall (C) space travel (D) flooding (E) drought (F) mines (G) wind (H) weather
[A]: D

[Q]: Fact1: Active immunity results when an immune response to a pathogen produces memory cells., Fact2: Pathogens are germs that cause disease., Question: Active immunity is when an immune response occurs after a germ produces what? (A) harmful substances (B) bioaerosols (C) rapid expansion (D) Allergies (E) anemia (F) it needs them (G) Chemical energy (H) memory cells
[A]: H

[Q]: Fact1: Most fungi get organic compounds from dead organisms., Fact2: Decomposers decay dead organisms or their wastes., Question: Most fungi get organic compounds from what? (A) Exfoliation (B) sunlight (C) litter (D) decomposers (E) burning coal (F) aqueous solution (G) fossil fuels (H) swamp vegetation
[A]:
D