This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Obs), Subject name: Gynaecology & Obstetrics
[{'content': 'Most common cause of infertility in females is due to the disorder of \nSelect and explain. \nA. Uterus, B. Ovarian, C. Vagina, D. Cervix', 'role': 'user'}, {'content': 'Answer: B \nExplanation: (B) Ovarian# Common causes of infertility of females include:> Ovulation problems (E.g. Polycystic ovarian syndrome, PCOS, the leading reason why women present to fertility clinics due to anovulatory infertility, tubal blockage, pelvic inflammatory disease caused by infections like tuberculosis> Age-related factors, Uterine problems, Previous tubal ligation, Endometriosis, Advanced maternal age', 'role': 'assistant'}]