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: phase changes do not change mass, Fact2: Weight is a product of gravity and mass., Question: What doesn't a phase change alter? (A) Glaciers (B) our star (C) hormones (D) Weight (E) Temperature (F) Warmth (G) an object (H) trout
Output:
D