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: cross-pollination increases genetic diversity, Fact2: Evolution requires genetic diversity., Question: What does evolution require? (A) Time and energy (B) Plant reproduction (C) cross-pollination (D) Reproduction (E) gene flow (F) coded genes (G) circulatory systems (H) animals with backbones
[EX A]: C

[EX Q]: Fact1: a light bulb is used for seeing in the dark, Fact2: Light is emitted by a light bulb., Question: What is required for seeing? (A) dark (B) sun (C) light (D) wind (E) retina (F) eyes (G) photons (H) copper
[EX A]: C

[EX Q]: Fact1: nerves can be used to feel heat and pressure on the skin, Fact2: Tight fitting shoes can increase the pressure on the skin and exacerbates the pain., Question: Heat and pain may be felt on the skin because of what? (A) sweating (B) Decibels (C) forces (D) nerves (E) heat (F) bones (G) muscles (H) arteries
[EX A]:
D