This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Medicine
Drug of choice for diphtheria carrier is: 
Select and explain. 
A. Penicillin, B. Erythromycin, C. Procaine penicillin, D. Tetracycline
B: Erythromycin
Answer: B: Erythromycin 
Explanation: Ans. is 'b' Erythromycin Drug of choice for diptheria carrier is erythromycin.