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': 'An elederly male presented with headache, fever and hemiparasis of right side. On further examination and investigation a diagnosis of brain abscess was made. Which of the following antibacterial/ antibacterials is effective in this patient - \nSelect and explain. \nA. Gentamycin, B. Doxycycline, C. Streptomycin, D. A combination of Cephalosporin and Metronidazole', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]