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: Caffeine is a central nervous system stimulant., Fact2: Over stimulation can cause sleep problems., Question: What can too much caffeine in your body cause? (A) energy usage (B) Sleep problems (C) Dehydration (D) heart problems (E) sweating (F) cancer (G) slow your body (H) negative
Output:
B