Detailed Instructions: 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: conserving water can be used for survival in a dry environment, Fact2: By definition, deserts are dry areas., Question: Conserving water can be used for survival in which region? (A) cactuses (B) watershed (C) river (D) stability (E) desert (F) lake (G) rainforest (H) Pacific
A:
E