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: an incandescent light bulb converts electricity into light by sending electricity through a filament, Fact2: Fiber optics works by carrying light along hair-thin filaments of glass., Question: an incandescent light bulb converts electricity into light by sending electricity through what? (A) hair-thin molecules (B) hair-thin spokes (C) epidermis and dermis (D) hydrogen and oxygen (E) activation energy (F) an electron lens (G) hair-thin hairs (H) hair-thin fibers of glass
Output:
H