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: the emission of sulfur dioxide causes acid rain, Fact2: The sulfur dioxide is converted into sulfuric acid., Question: what causes acid rain? (A) gases (B) rainfall (C) Pollution (D) fossil fuels (E) emissions (F) vehicles (G) burning (H) wind
[EX A]: E

[EX Q]: Fact1: harming an animal species has a negative impact on the population size of that species, Fact2: Sometimes hunting can impact animal populations., Question: What does hunting do to a species? (A) Plant growth is reduced (B) Decreases population (C) protect them (D) cause their death (E) Creates demand for the species (F) Strengthens the species (G) massive damage (H) Increases population
[EX A]: B

[EX Q]: Fact1: Antibodies are large, Y-shaped proteins that recognize and bind to antigens., Fact2: ALL immunogens are antigens., Question: What can antibodies (large Y-shaped proteins) recognize and bind to? (A) animals (B) fish (C) blood types (D) positive (E) immunogens (F) cats (G) humans (H) the skin
[EX A]:
E