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 light bulb is used for seeing in the dark, Fact2: Light is emitted by a light bulb., Question: What is emitted light used for ? (A) electricity (B) To see in the dark. (C) activation energy (D) heat energy (E) kinetic energy (F) an electron microscope (G) major threat to health (H) Electrical energy
Output:
B