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': 'Oral pill may prevent the development of : \nSelect and explain. \nA. Carcinoma breast, B. Ovarian malignancy, C. Sub - mucous fibroid, D. All of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ovarian malignancy', 'role': 'assistant'}]