What is the role of gonadotrophin in the body?

Gonadotrophin plays a crucial role in the reproductive system by regulating the functions of the gonads, which are the glands responsible for producing sex hormones and gametes. This hormone stimulates the growth and activity of the ovaries in females, leading to the production of estrogen and progesterone, as well as stimulating the testes in males to produce testosterone and sperm. This mechanism is essential for normal reproductive health, sexual development, and overall endocrine function.

The other options do not accurately describe gonadotrophin's primary function, as it is not a precursor of another hormone, a stimulant like those found in tea and coffee, or a drug associated with easing breathing. Instead, gonadotrophin is integral in stimulating the gonads, making the first option the correct choice.