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: an aquatic animal requires great amounts of water to survive, Fact2: Beavers are primarily aquatic animals., Question: what requires great amounts of water to survive (A) sunlight (B) beavers (C) octopus (D) mussels (E) trout (F) carbon (G) oxygen (H) amphibians
[EX A]: B

[EX Q]: Fact1: Balance is the ability to sense and maintain body position., Fact2: People fall when they lose their sense of balance., Question: the ability to sense and maintain body position prevents people what (A) falling (B) death (C) illness (D) starving (E) blindness (F) disease (G) depression (H) sweating
[EX A]: A

[EX Q]: Fact1: the vomiting reflex is used to remove toxic material from the stomach before it is absorbed, Fact2: Finally, lead is toxic., Question: What is used to remove lead from the stomach? (A) Vomiting reflex (B) heat energy (C) Fish hook (D) layers of fat (E) an electron microscope (F) evaporation (G) digestion (H) acid
[EX A]:
A