You will be given a definition of a task first, then some input of the task.
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: heating a liquid can be used to identify that liquid 's boiling point, Fact2: Boiling is the conversion of a liquid to a gas., Question: What can be learned from heating a liquid? (A) The bending of a ray of light (B) When it becomes a gas (C) chemical equations (D) When it becomes a solid (E) kinetic energy (F) When its mass increases (G) When it condenses (H) matter vibrating
Output:
B