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: keeping food cold is used for keeping food fresh, Fact2: The Purpose of Refrigeration The fundamental reason for having a refrigerator is to keep food cold., Question: What is an important function of a refrigertor? (A) cool the kitchen (B) adding heat (C) keep meat and vegetables separate (D) keep food fresh (E) heat energy (F) staying warm (G) freeze wine (H) Electrical energy
A:
D