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 animal usually requires a warm body temperature for survival, Fact2: Squirrels hide and sleep in a secret warm place all winter., Question: What requires hiding and sleeping for survival? (A) bacteria (B) rice (C) amphibians (D) organisms (E) Frogs (F) trees (G) humans (H) animals
[EX A]: H

[EX Q]: Fact1: if a living thing becomes too cold then that living thing will die, Fact2: Plants are also the oldest living things., Question: what dies if it becomes too cold? (A) plants (B) starfish (C) trout (D) planets (E) trees (F) ice (G) bears (H) clouds
[EX A]: A

[EX Q]: Fact1: a vehicle is used for transportation, Fact2: Transportation causes most of the air pollution in and around Vancouver., Question: A vehicle causes (A) negative feedback (B) Major effects (C) dehydration (D) Communication (E) feedback (F) damaging (G) heating (H) air pollution
[EX A]:
H