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 Input:
Fact1: seeing requires light, Fact2: Vision is our ability to see., Question: What is required for vision? (A) light (B) goggles (C) food (D) smell (E) hormones (F) Protein (G) color (H) hue

Ex Output:
A


Ex Input:
Fact1: Active immunity results when an immune response to a pathogen produces memory cells., Fact2: Vaccination is Active Acquired Immunity., Question: What results when an immune response to a pathogen produces memory cells? (A) anemia (B) vaccination (C) kill them (D) competition (E) lie detectors (F) rapid expansion (G) killing insects (H) it needs them

Ex Output:
B


Ex Input:
Fact1: Animals adapt to cold temperatures., Fact2: Temperatures are moderate in summer and COLD in winter., Question: What do animals do in the winter? (A) Release energy (B) running and lifting (C) it keeps an organism warm (D) adapt to warm weather (E) adapt to extreme heat (F) adapt to coolness (G) shed fur (H) by making heat

Ex Output:

F