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: 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: Earth 's tilt on its rotating axis causes seasons to change, Fact2: Weather changes from season to season., Question:  Earth 's tilt on its rotating axis causes changes in what (A) weather (B) sunlight (C) Joules (D) wind (E) heat (F) climate (G) energy (H) earth

Ex Output:
A


Ex Input:
Fact1: carbon dioxide concentrations in the air have increased over the last decade dramatically, Fact2: Carbon dioxide is formed by burning carbon., Question: Burning carbon concentrations have what? (A) Greenhouse gases (B) Chemical energy (C) reduced significantly (D) increased dramatically (E) Plant growth is reduced (F) heat energy (G) shrunk (H) declined spectacularly

Ex Output:

D