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: Playing is one way mammals and other animals learn how to behave., Fact2: Opossums are a type of mammal called marsupials., Question: what plays to learn how to behave? (A) opossums (B) humans (C) people (D) fish (E) exercise (F) ants (G) h2o (H) catabolism
[A]: A


[Q]: Fact1: a breathing mask is used for keeping harmful particles from entering the respiratory system, Fact2: Oxygen enters the respiratory system through the mouth and the nose., Question: Breathing masks are used to keep harmful particles from entering the mouth and the what? (A) body (B) eyes (C) air (D) skin (E) gullet (F) nose (G) ears (H) lungs
[A]: F


[Q]: Fact1: volcanic ash in the atmosphere decreases the temperature by blocking the sun, Fact2: Examples of such aerosols include dust, volcanic ash, and smoke., Question: some aerosols can decrease temperatures by blocking what (A) clouds (B) heat (C) matter (D) the wind (E) rainfall (F) visibility (G) the sun (H) pressure
[A]:
G