Q: 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: dehydrating food is used for preserving food, Fact2: Food is then dehydrated in slow oven or dehydrator., Question: What is used to preserve food? (A) salt (B) Energy (C) oven (D) fats (E) sugar (F) sodium (G) marine (H) bamboo
A:
C