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: Playing is one way mammals and other animals learn how to behave., Fact2: Sea lions are tactile mammals., Question: What do sea lions learn how to behave from? (A) exercise (B) Energy. (C) fish (D) Movement (E) Energy (F) playing (G) children (H) whales
[EX A]: F

[EX Q]: Fact1: Active immunity results when an immune response to a pathogen produces memory cells., Fact2: Pathogens are germs that cause disease., Question: Active immunity is when an immune response occurs after a germ produces what? (A) harmful substances (B) bioaerosols (C) rapid expansion (D) Allergies (E) anemia (F) it needs them (G) Chemical energy (H) memory cells
[EX A]: H

[EX Q]: Fact1: carpooling decreases the amount of cars used to travel to a place, Fact2: Ozone from cars creates smog., Question: How can smog be reduced? (A) Burning fuel (B) Flying airplanes (C) air cools (D) evaporation (E) exercise (F) vaporization (G) Driving more cars (H) Carpooling
[EX A]:
H