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
In which of the following organism does the capsule does not act as a virulence factor? 
Select and explain. 
A. H. influenzae, B. Strep pneumoniae, C. N. meningitidis, D. Bordetella peusis
D: Bordetella peusis
Answer: D: Bordetella peusis 
Explanation: Ans. (d) Bordetella peussis Antigenic constituents and Virulence factor of Bordetella Peussis toxin (most impoant) Tracheal cytotoxin Dermonecrotic toxin Lipo oligosoccharide Adenylate cyclase toxin Fimbriae Filamentous hemagglutinin (a component of cell wall) Peactin (an outer membrane protein)