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
Scaling can lead to uncontrolled bleeding during oral prophylaxis in a patient who is taking: 
Select and explain. 
A. Corticosteroids, B. Nifedipine, C. Phenytoin, D. Heparin
D: Heparin
Answer: D: Heparin 
Explanation: None