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': 'In a woman on subdermal progesterone implant, the menstrual abnormality seen is : \nSelect and explain. \nA. Menorrhagia, B. Metrorrhagia, C. Polymenorrhoea, D. Amenorrhoea', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. is b i.e. Metrorrhagia', 'role': 'assistant'}]