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
[{'content': 'Lipopolysaccharide is a major component of cell  wall  in: \nSelect and explain. \nA. Gram positive  bacteria, B. Gram negative  bacteria, C. Fungi, D. Parasites', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Endotoxins are lipopolysaccharide (LPS) in nature and form an integral part of the cell wall of gram-negative bacteria.\xa0\nThey are released from the bacterial surface by natural lysis of the bacteria or by the disintegration of the cell wall.\xa0\nThey are heat stable.\xa0\nThe toxicity of endotoxin depends on the lipid component (lipid A). Lipopolysaccharide binds to\xa0neutrophils via lipid A and alters neutrophil functions as follows:\n\t\nIt decreases chemotactic activity.\nRandom migration of neutrophils is decreased.\nAlters the metabolic and bactericidal properties of neutrophils.', 'role': 'assistant'}]