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: Microbiology
Drug of choice for carriers of diphtheria is - 
Select and explain. 
A. Penicillin, B. Septran, C. Tetracycline, D. Erythromycin
D: Erythromycin
Answer: D: Erythromycin 
Explanation: None