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").

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
B

Fact1: heating salt water causes the water to evaporate while the salt remains, Fact2: Flash evaporators are used to make fresh water from salt water., Question: Doing what to salt water causes the water to become fresh water? (A) watershred (B) freezing (C) Regrows it (D) migrate (E) pouring (F) heating (G) cooling (H) erosion
F

Fact1: Hormones control many cell activities, so they are very important for homeostasis., Fact2: Homeostasis is the chemical equilibrium of the body., Question: What control many cell activities and are very important for the chemical equilibrium of the body? (A) organs (B) Energy (C) critical organs (D) sweating (E) Organic compounds (F) pancreas (G) hydration (H) the hormones

H