Given the task definition and input, reply with output. 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").

Fact1: exercise has a positive impact on a human 's health, Fact2: Exercise Regular exercise is a sleep promoter., Question: What may improve health? (A) Enzymes (B) sleep (C) food (D) Lift (E) fats (F) insomnia (G) hunger (H) loud noises
B