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': 'Ovarian function after hysterectomy : \nSelect and explain. \nA. Increases, B. Decreases within 2 - 3 years, C. Remains the same, D. Decreases after 5 years', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Decreases after 5 years', 'role': 'assistant'}]