<prompt> Mechanism of action of progesterones in the medical management of endometriosis is?Deccidualisation and endometrial atrophyPrevention of retrograde menstruationThickening of cervical mucousPrevention of ovulation  <response>: Progesterones act by exeing an anti estrogenic effect and their continuous administration causes decidualisation and endometrial atrophy. The treatment over a period of 6 - 9 months produces a state of pseudopregnancy which ultimately causes regression of disease. It has no effect on ovulation Progestins used commonly are: Norethisterone Dydrogesterone Medroxyrogesterone acetate Mirena IUCD Dienogest 