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: adding salt to a solid decreases the freezing point of that solid, Fact2: Solutes decrease the freezing point or the point of crystallization of water., Question: What is one way to lower the freezing point of water? (A) add a solute (B) purify it (C) Solutions (D) remove impurities (E) Calcium carbonate (F) add water (G) evaporation (H) Dehydration
Output:
A