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: Organisms cluster around hydrothermal vents in the ocean floor., Fact2: To survive, some organisms living near hydrothermal vents have formed close associations., Question: How is survival ensured around hydrothermal vents? (A) heat produced (B) Eating a lot (C) Reproducing quickly (D) biological diversity (E) vegetation (F) Being in a cluster (G) Staying far apart (H) hydrate their cells
[EX A]: F

[EX Q]: Fact1: Cells are the basic units of the structure and function of living things., Fact2: Tigers are the largest of the living cats., Question: Cells are the basic units of the structure and function of what? (A) water (B) mammals (C) ice (D) tigers (E) animals (F) humans (G) plants (H) the Sun
[EX A]: D

[EX Q]: Fact1: Populations of viruses do not grow through cell division because they are not cells., Fact2: HIV, like other viruses, needs a host to survive., Question: what populations do not grow through cell division because they are not cells? (A) HPV (B) lung (C) AIDS (D) corn (E) plants (F) humans (G) mitosis (H) HIV
[EX A]:
H