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: Medicine
[{'content': 'A 45-year-old female is diagnosed as a case of pneumococcal meningitis. Her blood sample were sent for culture sensitivity. In the mean time best drug to start as an empirical treatment is - \nSelect and explain. \nA. Penicillin G, B. Doxycycline, C. Streptomycin, D. Vancomyin + Ceftriaxone', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]