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: a balance is used for measuring mass of an object, Fact2: Mass The base unit of mass is the gram., Question: what is a balance used for measuring in an object? (A) density (B) kinetic (C) volume (D) simple (E) forces (F) grams (G) Joules (H) viscosity
Output:
F