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: Organisms cluster around hydrothermal vents in the ocean floor., Fact2: Background Hot water vents form inside cracks in the ocean floor., Question: Organisms cluster around hot water inside cracks where? (A) loose soil (B) ocean floor (C) food and shelter (D) tectonic plates (E) the ground (F) allow growth (G) Absorb light (H) survive
[A]: B

[Q]: Fact1: when light enters the eye through the pupil , that light falls on the retina, Fact2: Images are retained on the retina of a viewer's eye for a fraction of a second after they strike it., Question: Where are images retained? (A) Retina (B) RNA (C) calcite (D) an object (E) arteries (F) energy (G) squids (H) segmented
[A]: A

[Q]: Fact1: a thermometer is used to measure temperature, Fact2: Temperature Temperature is an measurement of the amount of heat., Question: what is a thermometer used for measuring? (A) With feedback loops (B) blood pressure (C) rapid changes occur (D) barometric changes (E) volume (F) Low pressure (G) homeostasis (H) amount of heat
[A]:
H