This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neisseria, Subject name: Microbiology
[{'content': 'Neisseria meningitidis possesses following virulent factors EXCEPT: \nSelect and explain. \nA. Capsule, B. Lipo-oligosaccharide(LOS), C. p lactamase, D. IgA protease cation', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. (c) b lactamaseRef.: Microbiology by Ananthanarayan and Paniker 8th ed. /224-26* Lipo-oligosaccharide (LOS) is a component of the outer memberane of N. meningitidis which acts as an endotoxin which is responsible for septic shock and hemorrhage due to the destruction of red blood cells.* Other virulence factors include a polysaccharide capsule which prevents host phagocytosis and aids in evasion of the host immune response; and fimbriae which mediate attachment of the bacterium to the epithelial cells of the nasopharynx.* Beta-lactumases are enzymes (and not virulence factors) produced by some bacteria and are responsible for their resistance to beta-lactam antibiotics like penicillins and carbapenems', 'role': 'assistant'}]