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: 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

A: C
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Q: Fact1: Pneumonia may be caused by an infection or injury of the lungs., Fact2: Mammals breathe air with lungs., Question: What may be caused by an infection or injury of the organs used to breathe air? (A) Toxicity (B) smoking (C) fertilization (D) pneumonia (E) a broken leg (F) oxygenation (G) Dehydration (H) the skin

A: D
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Q: Fact1: Pneumonia may be caused by an infection or injury of the lungs., Fact2: Death was attributed to pneumonia., Question: what can infection or injury of the lungs result in? (A) harm (B) swea (C) death (D) h2o (E) damage (F) ribs (G) gas (H) digestion

A:
C
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