Instructions: 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").
Input: Fact1: Antibodies are large, Y-shaped proteins that recognize and bind to antigens., Fact2: Antibody production is triggered by antigens., Question: Antigens produce large, Y-shaped what? (A) Allergies (B) epidermal (C) deltas (D) bioaerosols (E) Joules (F) parasites (G) proteins (H) PDAs
Output:
G