You will be given a definition of a task first, then some input of the task.
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").

Fact1: a black hole is formed by a high-mass star collapses, Fact2: Essentially, a black hole is a gravity drain., Question: What is formed by a high-mass star collapses? (A) grave error (B) an object (C) a gravity drain (D) mass grave (E) deoxyribonucleic acid (F) Physical weathering (G) gravity depletion (H) hydrogen and oxygen
Output:
C