This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Microbiology
[{'content': 'The polysaccharide capsule of following bacteria has in role in their infectivity except \nSelect and explain. \nA. Haemophilus influenza, B. Neisseria meningitides, C. Streptococcus pneumoniae, D. Bordetella peussis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The polysaccharide capsule of Bordetella peusis has no significant role in its infectivity. Bordetella fresh cultures demonstrated capsules but its virulence is mainly toxin-mediated.', 'role': 'assistant'}]