This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacterial infections, Subject name: Dental
Treatment of choice for severe impetigo? 
Select and explain. 
A. Incision and drainage of severe lesions, B. Systemic antibiotics, C. Topical antibiotics, D. Anti-septic dressing
B: Systemic antibiotics
Answer: B: Systemic antibiotics 
Explanation: Treatment of choice for severe impetigo: systemic antibiotic for 7 to 10 days to prevent glomerulonephritis, a dangerous complication. Topical antibiotics are less effective than systemic antibiotics in treating impetigo.