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: 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: extreme heat and pressure change rock into metamorphic rock, Fact2: Marble is a form of metamorphic rock., Question: What is formed from extreme heat and pressure? (A) glass (B) marble (C) crust (D) soils (E) coal (F) sugar (G) calcite (H) arteries
[EX A]: B

[EX Q]: Fact1: fossil fuels are formed from dead organisms over time, Fact2: Decomposers decay dead organisms or their wastes., Question: What are fossil fuels the product of? (A) decay (B) fire (C) Energy (D) burning (E) tar (F) engines (G) oil (H) coal
[EX A]:
A