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
[{'content': 'True about endometriosis is/are \nSelect and explain. \nA. Endometrial sarcoma is most common, B. Premenstrual spotting absent, C. Most common in 3rd or 4th decade, D. True cyst', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Most common age group is between 30-45years\nAbnormal menstruation seen in 20%\nMenorrhagia is seen\nIf the ovaries are also involved polymenorrhea, epimenorrhagia may be pronounced\nMaybe premenstrual spotting seen\nMalignancy is rare, commonest being adenocarcinoma', 'role': 'assistant'}]