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: Social & Preventive Medicine
Treatment of choice for diphtheria carriers is: 
Select and explain. 
A. Erythromycin, B. Tetracycline, C. Penicillin, D. DPT
A: Erythromycin
Answer: A: Erythromycin 
Explanation: Erythromycin