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").
Input: Fact1: using renewable resources to generate power reduces greenhouse gases, Fact2: Carbon dioxide is a greenhouse gas., Question: What does using renewable resources to generate power reduce? (A) Heat energy (B) carbon dioxide (C) kinetic energy (D) lowered energy cost (E) sunlight (F) oxygen (G) climate (H) water
Output:
B