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: Skin color is another polygenic trait., Fact2: Most dental variations are polygenic, that is controlled by several genes., Question: Skin color is a trait controlled by what? (A) prokaryotic cells (B) one gene (C) enzymes (D) keratin (E) one's descendants (F) several genes (G) the environment (H) a single gene
[A]: F

[Q]: Fact1: Most salamanders use their sense of smell to find a mate., Fact2: Like frogs, salamanders are amphibians., Question: What uses its sense of smell to find a mate? (A) the Sun (B) peachleaf willow (C) rocks (D) fur seals (E) warm-blooded (F) trees (G) passenger pigeons (H) some amphibians
[A]: H

[Q]: Fact1: Aging is associated with the death of cells., Fact2: Fruit browning is believed to be a process of early cell aging and death., Question: What is fruit browning associated with? (A) mildew (B) loss (C) fungi (D) Poisonous (E) Ripeness (F) Freshness (G) Aging (H) drought
[A]:
G