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
Drug of choice for whooping cough 
Select and explain. 
A. Azithromycin, B. Erythromycin, C. Rifampicin, D. Tetracyclin
B: Erythromycin
Answer: B: Erythromycin 
Explanation: None