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 uncommon change to occur in a myoma is : \nSelect and explain. \nA. Calcification, B. Red degeneration, C. Malignant change, D. Hyaline change', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Malignant change', 'role': 'assistant'}]