Dysmenorrhoea is due to ?

Ans. is'b'i.e., Decreased progesteroneDysmenorrhoea refers to painful cramping pain accompanying menstruation.Dysmenorrhoea in ovulatory cycle is due to release of PGs, in endometrium induced by progesteroneDysmenorrhoea is classified into :Primary dysmenorrhoea refers to one that is not associated with any identifiable pelvic pathology. It is now clear that the pathogenesis of pain is attributable to a biochemical derangement.Secondary dysmenorrhoea refers to the one associated with the presence of organic pelvic pathology, i.e. fibroids, adenomyosis, PID endometriosis. Unilateral dysmenorrhoea occurs in a rudimentary horn of a bicornuate uterus