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: measuring the hardness of minerals requires scratching those materials, Fact2: Harder minerals can scratch softer minerals., Question: Measuring hardness of minerals requires a harder what? (A) calcium (B) as a base (C) cartilage (D) mineral (E) stoma (F) osculum (G) the same (H) weater
Output:
D