## Core Concept
Adolescence is a stage of human development that occurs between childhood and adulthood, characterized by significant physical, psychological, and social changes. It is generally defined by age ranges. The World Health Organization (WHO) defines adolescence as the period between 10 to 19 years of age.

## Why the Correct Answer is Right
The correct answer, , corresponds to the age of 10-19 years, which is the widely accepted definition of adolescence by global health authorities. This stage is crucial for growth spurts, development of secondary sexual characteristics, and psychological maturation.

## Why Each Wrong Option is Incorrect
* **Option A:** This age range is too early and corresponds more closely to late childhood.
* **Option B:** This option suggests a broader age range that extends into young adulthood.
* **Option D:** This option suggests an age range that is too narrow and does not fully capture the adolescent period.

## Clinical Pearl / High-Yield Fact
A key point to remember is that adolescence is a critical period for interventions related to health, education, and social integration, as it lays the foundation for adult life. Clinicians often focus on preventive care, such as vaccinations, health screenings, and counseling on lifestyle choices during this stage.

## Correct Answer: B. 10-19 years.