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: Loss of ozone has created an ozone hole over Antarctica., Fact2: Another sign of global warming is a hole in the ozone layer over Antarctica., Question: Global warming has created an ozone what? (A) layer (B) hole (C) heat (D) film (E) death (F) gas (G) documentary (H) stormy
A:
B