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: 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
[A]: G

[Q]: Fact1: volcanic ash in the atmosphere decreases the temperature by blocking the sun, Fact2: Ash clouds are a particular problem for aircraft., Question: What are particular problems for aircraft in the atmosphere? (A) transportation (B) clog airways (C) extremely low humidity (D) volcanic clouds (E) feedback mechanisms (F) negative feedback (G) gas spreads in the air (H) very complex
[A]: D

[Q]: Fact1: a greenhouse is used to protect plants from the cold, Fact2: Flowers are beautiful kinds of plants., Question: A greenhouse is used to protect flowers from what? (A) sunlight (B) fertilizer (C) salinity (D) Dehydration (E) cold air (F) the cold (G) Winter (H) irrigation
[A]:
F