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: Pediatrics
The antibiotic of choice of pertussis is – 
Select and explain. 
A. Ampicillin, B. Gentamicin, C. Erythromycin, D. Penicillin
C: Erythromycin
Answer: C: Erythromycin 
Explanation: Treatment of pertussis

DOC → Macrolides (Erythromycin, Azithromycin, Clarithromycin)
Alternative → Cotrimoxazole