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: Active immunity results when an immune response to a pathogen produces memory cells., Fact2: Vaccination is Active Acquired Immunity., Question: What results when an immune response to a pathogen produces memory cells? (A) anemia (B) vaccination (C) kill them (D) competition (E) lie detectors (F) rapid expansion (G) killing insects (H) it needs them
[EX A]: B

[EX Q]: Fact1: carpooling decreases the amount of cars used to travel to a place, Fact2: Carpooling cuts down on congestion and pollution., Question: What decreases when we decrease the amount of cars traveling to one place? (A) Temperature (B) Heart rate (C) Climate change (D) Pollution (E) Clean air (F) forces (G) Burning fossil fuels (H) gene flow
[EX A]: D

[EX Q]: Fact1: Some mollusks are nearly microscopic., Fact2: Ribosomes are too small to see in the light microscope., Question: Some mollusks are nearly what? (A) more abundant (B) scarce resources (C) too sad to talk to (D) too large to touch (E) major threat to health (F) too small to see (G) too big to see (H) important habitats
[EX A]:
F