This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.N.S, Subject name: Medicine
[{'content': 'An elederly male presented with headache, fever and hemiparasis of right side. On fuher 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: A 6-week combination of third-generation cephalosporin and metronidazole cures most cases of community-acquired brain abscess in immunocompetent patients. Coverage for streptococci can be attained by a high dose of penicillin G or a third-generation cephalosporin (eg, cefotaxime, ceftriaxone Ref Harrison20th edition pg 2234', 'role': 'assistant'}]