This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Gynaecology & Obstetrics
Dysmenorrhoea is due to ? 
Select and explain. 
A. Ovulation, B. Decreased progesterone, C. Increasedprogesterone, D. Secretoryepithelium
B: Decreased progesterone
Answer: B: Decreased progesterone 
Explanation: 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