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': 'Weil felix reaction is heterophile antibodies reaction due sharing of Rickettsial antigen with \nSelect and explain. \nA. Shigella, B. Proteus, C. Chlamydia, D. Mycoplasma', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Proteus Weil felix reaction This reaction is an agglutination test in which sera are tested for agglutinins to 0 antigens of ceain nonmotile proteus strains OX -19, OX - 2 and OX - K. The basis of the test is the sharing of an alkali - stable carbohydrate antigen by some rickettsiae and by ceain strains of proteus, P. vulgaris OX - 19 and OX - 2 and P. mirabilis OX - K. The test is usually done as a tube agglutination, though rapid slide agglutination methods have been employed for screening", 'role': 'assistant'}]