This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Other topics and Adverse effects, Subject name: Pharmacology
[{'content': 'A 14 year old boy present with headache, fever and cought for 2 days. Sputum is scant and non-purulent and gram stain reveals many whit cells but no organisms. The treatment should be initiated with: \nSelect and explain. \nA. Cefazolin, B. Erythromycin, C. Amikacin, D. Trovafloxacin', 'role': 'user'}, {'content': 'Answer: B \nExplanation: (Ref: KDT 6/e p729) Diagnosis is atypical pneumonia and DOC is erythromycin.', 'role': 'assistant'}]