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': 'Endometriosis is common in : \nSelect and explain. \nA. Multiple, B. Peri menopausal age, C. Nullipara, D. Virgins', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Nullipara', 'role': 'assistant'}]