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. Polymenorrhea, D. Amenorrhea', 'role': 'user'}, {'content': 'Answer: B \nExplanation: In progesterone only contraceptives whether injections/IUCDs/implants, the most common problem is–irregular vaginal bleeding i.e metrorrhagia\nSubdermal progesterone implants include:', 'role': 'assistant'}]