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: 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

A: B
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Q: Fact1: lakes are formed by precipitation and runoff, Fact2: Runoff from precipitation is a natural part of the water cycle., Question: What are some of the steps that forms a lake? (A) decomposition and respiration (B) storing water (C) photosynthesis and solar energy (D) near the shoreline (E) precipitation and run-off (F) perspiration and excretion (G) The area was once underwater (H) At the peak of a mountain

A: E
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Q: Fact1: Some viruses live in a dormant state inside the body., Fact2: Viruses Viruses are agents that infect cells, yet lack many of the characteristics of life., Question: Some agents that infect cells live in what state inside the body? (A) solid (B) conscious (C) expelled (D) bacteria (E) infected (F) dormant (G) cellular (H) protected

A:
F
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