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: soil is formed by rocks eroding, Fact2: Rivers erode the rocks they flow over., Question: What is formed by rivers? (A) fish (B) soil (C) rain (D) bamboo (E) spring (F) clouds (G) kayaks (H) NaCl
[A]: B


[Q]: Fact1: Mutations may change the structure of a chromosome or just change a single nucleotide., Fact2: SNPs involve polymorphisms at the single nucleotide level., Question: What is a potential outcome of genetic mutation? (A) HIV (B) albino (C) anemia (D) pizza eating turtles (E) genealogy (F) SNPs (G) biology (H) death
[A]: F


[Q]: Fact1: smoking tobacco decreases stamina, Fact2: Tobacco is smoked in pipes or in cigarettes or bidis., Question: What decreases stamina? (A) water (B) liver cancer (C) cancer (D) food (E) cigarettes (F) burning (G) toxins (H) exercise
[A]:
E