Which of the following is male sex hormone?

Testosterone

The correct answer is Option (4) → Testosterone.

Testosterone is the primary male sex hormone produced mainly in the testes in males and in smaller amounts in the ovaries and adrenal glands in females. It plays a crucial role in the development of male reproductive tissues, the promotion of secondary sexual characteristics (such as increased muscle and bone mass, and the growth of body hair), and overall male health.

Other Options:

Adrenaline: Also known as epinephrine, this is a hormone and neurotransmitter involved in the body's fight-or-flight response. It is not a sex hormone.

Cortisol: This is a steroid hormone produced by the adrenal glands that helps regulate metabolism, immune response, and stress response. It is not a sex hormone.

Estrogen: This is a group of hormones primarily involved in the development of female secondary sexual characteristics and reproductive functions. It is not a male sex hormone.

Thus, testosterone is the male sex hormone among the options provided.