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
All of the following agents have polysaccharide capsule related antigen antibody responses except - 
Select and explain. 
A. Pneumococcus, B. Meningococcus, C. Haemophilus influenzae, D. Bordetella pertussis
D: Bordetella pertussis
Answer: D: Bordetella pertussis 
Explanation: None