This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteria, Subject name: Microbiology
[{'content': 'Proteus antigen cross react with: \nSelect and explain. \nA. Klebsiella, B. Chlamydiae, C. Rickettsiae, D. E. coli', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. 'c' i.e., Rickettsiae(Ref: Ananthanarayan, 9th/e, p. 410)Proteus antigens (OX19, OX2, OXK Strains) cross reacts with group specific alkali stable lipopolysaccharide rickettsial antigens. The application of this property is done in the Weil Felix (heterophile agglutination) test.", 'role': 'assistant'}]