Definition: 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: heating a liquid can be used to identify that liquid 's boiling point, Fact2: Lots of gas bubbles burst over the boiling lakes' surface., Question: Heating a liquid can cause what? (A) direct damage to the lungs (B) gas bubbles to burst (C) Something to move (D) It expands (E) The bending of a ray of light (F) chemical reaction (G) enormous damage to homes (H) matter vibrating
Output:
B