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: Streams may start with runoff or water seeping out of a spring., Fact2: Streams A stream is a sequence of characters., Question: a sequence of characters may start with runoff or what seeping out of a spring? (A) sodium (B) Joules (C) liquid (D) rivers (E) solutes (F) water (G) rain (H) SO2
[EX A]: F

[EX Q]: Fact1: Some viruses can cause cancer., Fact2: Cancer is an example of a mutation in cells., Question: What can mutate cells? (A) Allergies (B) water (C) fruits (D) flow of electrons (E) vegetables (F) harmful substances (G) rays or beams (H) some viruses
[EX A]: H

[EX Q]: Fact1: Competition may lead to aggressive behaviors or displays of aggression., Fact2: Frequently their behavior is aggressively hostile., Question: Hostility can be one outcome of: (A) relocation (B) behavior research (C) decrease stamina (D) forces (E) fungi (F) competition (G) tolerance (H) Gunshots
[EX A]:
F