This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory System, Subject name: Pediatrics
[{'content': 'A 6-year-old girl presents with a 2-day history of cough and fever. At your office, she has a temperature of 39.4degC (103degF), a respiratory rate of 45 breaths per minute, and decreased breath sounds on the left side. Her chest x-ray is shown below. Which of the following is the most appropriate initial treatment? \nSelect and explain. \nA. N-acetylcysteine and chest physiotherapy, B. Vancomycin, C. Partial lobectomy, D. Postural drainage', 'role': 'user'}, {'content': 'Answer: B \nExplanation: (b) Source: (Hay et al, pp 1171, 1173-1174. Kliegman et al, pp 905-906, 1474-1479. McMillan et al, pp 1407-1411. Rudolph et al, pp 997, 1092.) The x-ray reveals a lung empyema on the left side, characterized by nearly complete white out of that side by the pleural or extrapleural fluid collection. Lung abscesses are usually caused by S aureus, S pneumoniae, or S pyogenes. These organisms, previously sensitive to penicillin, now have a variety of resistance patterns requiring extended spectrum antibiotics or vancomycin. Patients who do not improve quickly with antibiotic therapy alone are also surgical candidates.', 'role': 'assistant'}]