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
In regenerative endodontic therapy of young permanent teeth, metronidazole is replaced by 
Select and explain. 
A. Ornidazole, B. Doxycycline, C. Chloramphenicol, D. Cloxacillin
A: Ornidazole
Answer: A: Ornidazole 
Explanation: None