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: Dental
[{'content': 'Scaling can lead to uncontrolled bleeding during oral prophylaxis in a patient who is taking: \nSelect and explain. \nA. Corticosteroids, B. Nifedipine, C. Phenytoin, D. Heparin', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]