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: friction causes an object to lose energy, Fact2: Objects An object can be one of several things., Question: What does friction cause things to lose? (A) heat (B) moisture (C) toughness (D) Energy. (E) traits (F) light (G) energy (H) cartilage

Ex Output:
G

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: hearing is used for sensing sound by animals, Fact2: Coyotes use their acute hearing and sense of smell to detect prey and avoid danger., Question: What is used for detecting prey and avoiding danger by animals? (A) messengers (B) feeding (C) hiding (D) hearing (E) hormones (F) eating (G) energy (H) the eyes

Ex Output:
D