This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Microbiology
[{'content': 'All of the following causes meningitis in the elderly except \nSelect and explain. \nA. Streptobacillus moniliformis, B. Pneumococci, C. Gram negative bacteria, D. Listeria', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Meningitis in elderly people - streptococcus pneumoniae, staphylococcus aureus, gram-negative enteric bacilli. Streptobacillus moniliformis - Rat bite fever Ref: Baveja textbook of microbiology; 4th edition', 'role': 'assistant'}]