Definition: 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: temperature changing can cause phase changes, Fact2: If climate changes and temperatures rise, there are a number of potential effects., Question: What phase change are we experiencing now? (A) solid, liquid, gas (B) Climate change (C) Freezing temperatures (D) Apocalyptic (E) population movement (F) global warming (G) gene flow (H) Warm air
Output:
B