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: hurricanes convert heat energy into mechanical energy, Fact2: Hurricanes A hurricane is a type of tropical cyclone., Question: What's an example of something that converts heat energy into mechanical energy? (A) Roller coaster (B) Tropical cyclone (C) dangerous (D) objects that have mass (E) Electric heater (F) electricity (G) Candle (H) an engine
A:
B