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': 'Following are associated with high risk of ovarian cancer except \nSelect and explain. \nA. Endometriosis, B. Smoking, C. Obesity, D. Multiparity', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Nulliparity is a risk factor for ovarian cancer.', 'role': 'assistant'}]