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': 'The commonest presenting complaint In a gynaecology depament is : \nSelect and explain. \nA. Bleeding PV, B. Leucorrhoea, C. Prolapse uterus, D. Mass abdomen', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Leucorrhoea', 'role': 'assistant'}]