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: Microbiology
[{'content': 'All cause meningitis in the elderly except - \nSelect and explain. \nA. HSV2, B. Pneumococci, C. Gram negative bacteria, D. Listeria', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., HSV2 Causes of meningitis in elderly .Pneumococci (most common) . Gram negative bacilli . Staphylococcus aureus . Meningiococci (2nd most common) . Listeria monocytogenes . Streptococcus . H. influenzae . M. tuberculosis", 'role': 'assistant'}]