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: a black hole is formed by a high-mass star collapses, Fact2: Collapsed stars are dead stars., Question: Black holes are formed from _ stars. (A) small (B) dead (C) new (D) SO2 (E) deadly (F) gas (G) matter (H) falling
Output:
B