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': "All ICUD's are changed every 4-5 year except: \nSelect and explain. \nA. Cu 280, B. Cu 320, C. Multiload devices, D. Progestasert", 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]