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: Prokaryotes are single-celled organisms that lack a nucleus., Fact2: Prokaryotes are usually microscopic and bacteria is an example of a prokaryote., Question: What are single celled organisms that do not have a nucleus? (A) Most plants (B) nucleus (C) ferns (D) fossil fuels (E) bushes (F) Eukaryotes (G) leech (H) bacteria
H

Fact1: a black hole is formed by a high-mass star collapses, Fact2: Black Holes Black holes are the inevitable conclusion of Einstein's General Theory of Relativity., Question: When do stars fulfill the inevitable conclusion of Einstein's General Theory of Relativity? (A) inactive (B) Winter (C) an object (D) observe it (E) collapse (F) light (G) our star (H) ligt
E

Fact1: a breathing mask is used for keeping harmful particles from entering the respiratory system, Fact2: Oxygen enters the respiratory system through the mouth and the nose., Question: Breathing masks are used to keep harmful particles from entering the mouth and the what? (A) body (B) eyes (C) air (D) skin (E) gullet (F) nose (G) ears (H) lungs
F