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': 'Which of the following is not capsulated ? \nSelect and explain. \nA. Pneumococcus, B. Cryptococcus, C. Meningococcus, D. Proteus', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Proteus Capsule Many bacteria secrete a viscid material around the cell surface. When this is organized into a sharply defined structure, it is known as capsule. Capsules are protective and protect the bacteria from phagocytosis and from lytic enzymes. Some bacteria loose their capsules on repeated subcultures. Capsulated organisms Pneumococcus Yersinia Bacillus anthrax V. parahemolyticus Bordetella H. influenzae Meningococci Fresh strains of staphylococci, streptococci and 'E coli. Cl. perfringens and Cl. butyric= Bacteroides Klebsiella Cryptococcus.", 'role': 'assistant'}]