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
If a patient is allergic to penicillin and antibiotic prescription is an absolute need in endodontic treatment than which of the following antibiotic can be given: 
Select and explain. 
A. Clindamycin., B. Clavulanic acid., C. Doxycycline., D. Erythromycin.
A: Clindamycin.
Answer: A: Clindamycin. 
Explanation: “For those patients who are allergic to penicillin or cephalosporin, the recommended antibiotic is clindamycin (600 mg per os, 1 hour before procedure".