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': 'A 55yrs man presents to the OPD with low grade fever, cough since 5 days, he says that there is increased production of sputum. He is a known case of chronic bronchitis , diabetes. All of the following are used by the causative organism to cause the disease except? \nSelect and explain. \nA. Pili, B. Outer membrane protein, C. Lipooligosaccharide, D. Capsular polysaccharide', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The given clinical scenario describes exacerbation of COPD, the most common cause is nontypable H. influenza. Non-typable Haemophilus influenzae lack a capsule and a capsular antigen. The exacerbations of COPD are characterized by low grade fever, increased cough, sputum production, and shoness of breath. H. influenzae has the following virulence factors: Capsular polysaccharide Outer membrane proteins (OMP) Lipo-oligosaccharide(LOS) Pili The capsule is absent in non-typable H. influenzae. Reference: Ananthanarayan and Paniker&;s Textbook of Microbiology Tenth edition', 'role': 'assistant'}]