This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: general microbiology, Subject name: Microbiology
[{'content': 'All the following are features of Endotoxins Except \nSelect and explain. \nA. Lipopolysaccharides, B. Proteins, C. Heat stable, D. No enzymic action', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Distinguishing features of exotoxins and endotoxinsExotoxinsEndotoxinsProteinsLipopolysaccharidesHeat-labileHeat StableActively secreted by cells; diffuse into surrounding mediumForm pa of the cell wall; do not diffuse into surrounding mediumReadily separable from cultures by physical means such as filtrationObtained only by cell lysisAction often enzymicNo enzymatic actionSpecific pharmacological effect for each exotoxinEffect nonspecific; action common to all endotoxinsSpecific tissue affinitiesNo specific tissue affinityActive in very minute dosesActive only in very large dosesHighly antigenicWeakly antigenicAction specifically neutralized by antibodyNeutralisation by antibody ineffectiveRef: Ananthanarayan; 7th edition; Page no: 67', 'role': 'assistant'}]