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: a battery converts chemical energy into electrical energy, Fact2: Battery life is several months for a AA lithium cell., Question: what converts chemical energy into electrical energy (A) sensory neurons (B) AA lithium cell (C) rotten food (D) Firecrackers (E) an engine (F) deoxyribonucleic acid (G) magnets (H) plants
Output:
B