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: boiling is when liquids are heated above their boiling point, Fact2: Lots of gas bubbles burst over the boiling lakes' surface., Question: What happens when liquids are heated? (A) Evaporation (B) chemical reaction (C) air is cooled (D) food is chilled (E) It expands (F) gas bubbles burst (G) flow of electrons (H) bubbles reduce
Output:
F