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 percentage of myomas undergoing malignant transformation : \nSelect and explain. \nA. 10%, B. 5%, C. 1%, D. 0.50%', 'role': 'user'}, {'content': 'Answer: D \nExplanation: 0.50%', 'role': 'assistant'}]