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: 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: Aging is associated with the death of cells., Fact2: When telomeres become too short, the cell dies., Question: What is associated with aging? (A) Extra cells (B) intelligence (C) forest is destroyed (D) Chemical energy (E) Strong cells (F) oxidation reaction (G) Short telomeres (H) massive damage
[EX A]: G

[EX Q]: Fact1: Heterotrophs get food by eating other living things., Fact2: Great egrets are heterotrophs ., Question: Great egrets get food by doing what? (A) sleeping (B) eating other living things (C) Transfers energy (D) converting mass to energy (E) Something coming from a gland (F) photosynthesis (G) dying (H) competing for resources
[EX A]:
B