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
Which of the following drug increases the duration of orthodontic treatment? 
Select and explain. 
A. Phenytoin, B. Aspirin, C. Paracetamol, D. Vitamin D
B: Aspirin
Answer: B: Aspirin 
Explanation: None