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 laser is used for producing light, Fact2: Light is the visible form of electromagnetic energy., Question: A laser is used for producing what? (A) an electron microscope (B) electromagnetic energy (C) heat is produced (D) chemical changes (E) Electrical energy (F) hydrogen and oxygen (G) activation energy (H) objects that have mass
B