What is the initial physical sign of puberty in males?

• A. Testicular enlargement
• B. Voice deepening
• C. Pubic hair development
• D. Penile growth

Answer: (A)

The main idea being tested is what signals the start of puberty in boys. The earliest physical sign is the enlargement of the testes. This reflects the activation of the hypothalamic-pituitary-gonadal axis and a rise in gonadotropins that stimulates the testes to grow and begin producing more testosterone. This initial growth sets the stage for later puberty changes.

Voice deepening, pubic hair development, and penile growth all come after this first sign. Testosterone drives these later changes: the voice gradually deepens as the larynx enlarges and the vocal cords lengthen; pubic hair appears and thickens; penile growth progresses as puberty advances. So, the very first visible change is the testes enlarging, with the other features developing subsequently.