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: Some parasites kill their host, but most do not., Fact2: Parasites include lungworms and GI parasites., Question: What can kill their host? (A) cigarettes (B) bacteria (C) adding heat (D) heat or cold (E) burning (F) Dehydration (G) lungworms (H) Pollution
[EX A]: G

[EX Q]: Fact1: Antigens are molecules that the immune system recognizes as foreign to the body., Fact2: Children are born with an immature immune, or defense, system., Question: What are molecules that the defense system recognizes as foreign to the body? (A) Allergies (B) lungs (C) antigens (D) bacteria (E) parasites (F) atoms (G) red blood cells (H) acetic acid
[EX A]: C

[EX Q]: Fact1: friction causes an object to lose energy, Fact2: For example, the word Car refers to a type of object, so Car is a class., Question: Friction causes a car to what? (A) renew energy (B) to move people (C) increase velocity (D) imbalanced (E) squeeze (F) lose energy (G) speed up (H) contracting
[EX A]:
F