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: Microbiology
Drug of choice for carriers of diphtheria is 
Select and explain. 
A. Penicillin G, B. Septran, C. Tetracycline, D. Erythromycin
D: Erythromycin
Answer: D: Erythromycin 
Explanation: Corynebacterium diphtheriae is sensitive to Penicillin and can be cleared from the throat within a few days by Penicillin treatment. Erythromycin is more active than Penicillin in the treatment of carriers. Reference: Textbook of Microbiology; Anathanarayan and panicker's; 10th edition; Page no: 245