Gonadotropin levels decline to prepubertal levels by age: (A) 6 month to 1 year of age, (B) 1 year to 2 years of age, (C) 2 years to 3 years of age, (D) 3 years to 4 years of age.
Answer is B. Gonadotropin levels gradually decline to reach prepubertal levels by age 1 to 2 years.