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").
Q: Fact1: a switch is used to start the flow of current in an electrical circuit, Fact2: Electrical power including lights etc can then be switched on., Question: what are on when there is flow of current in an electrical circuit (A) energy (B) lights (C) engine (D) cycles (E) brakes (F) waves (G) water (H) Vibrates
A:
B