Which of the following products is a corticosteroid?

Progesterone is a steroid hormone primarily involved in the menstrual cycle and pregnancy. While it is a steroid, it is classified as a progestin, not a corticosteroid. Its primary role is related to the reproductive system rather than the anti-inflammatory activities characteristic of corticosteroids.

Methyltestosterone is an anabolic steroid that serves as a synthetic derivative of testosterone. Its primary applications are in promoting muscle growth and treating hormonal deficiencies, but it does not possess the anti-inflammatory or immunosuppressive properties associated with corticosteroids.

Spironolactone is a potassium-sparing diuretic that also has anti-androgen effects. It is used primarily to treat conditions like hypertension and edema, but it is not classified as a corticosteroid. Its mechanism of action differs significantly from that of corticosteroids, focusing more on fluid balance and hormonal regulation.