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: Puberty is the period during which humans become sexually mature., Fact2: Boys enter puberty at about 12 years of age., Question: When is when boys become sexually mature? (A) death (B) winter (C) trees and flowers (D) 40 years old (E) 5 years old (F) coelenterates (G) 12 years old (H) weater
G