Which of the following controls the activity of all the others?

O

ovaries

O

testes

O

hypothalamus

O

pituitary glands

Pituitary Glands

Explanation:

The pituitary gland is crucial as it takes messages from the brain and uses them to produce hormones which affects many parts of the body, including stimulating all the other hormone-producing glands to create their hormones. Due to this reason, it is often referred as the 'master gland.' The front pituitary produces hormones which affect the breasts, adrenals, thyroid, ovaries and testes.