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").
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Question: 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

Answer: B

Question: Fact1: shelter is used for protection by animals against weather, Fact2: Many animals use sponges for shelter., Question: What can animals use for protection? (A) hair (B) bushes (C) keratin (D) food (E) shells (F) appendages (G) energy (H) sponges

Answer: H

Question: Fact1: evaporation can be used for separating a solute from a solvent in a solution, Fact2: Heating liquids is also made easier by allowing saturated gas to reduce evaporation., Question: What can be used to separate a solute from a solvent in a solution? (A) flow of electrons (B) Dehydration (C) heat energy (D) heating liquids (E) a hydraulic system (F) water vapor (G) kinetic energy (H) Time and energy

Answer:
D