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: Surgery
[{'content': "'Rubber band' extraction is a method of extraction in patients having \nSelect and explain. \nA. Bleeding disorders, B. Myocardial infarction and angina pectoris, C. Supernumerary teeth, D. Impacted teeth", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]