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: Unknown
[{'content': 'A heterophile antibody is found in - \nSelect and explain. \nA. Weil Felix test, B. Widal test, C. Elisa, D. All', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Weil Felix test Heterophilic agglutination reaction o Some organisms of different class or species share closely related antigens. o When serum containing agglutinin (antibody) of one organism gives agglutination reaction with the antigen of another organism, it is called heterophilic agglutination test. Examples are o Streptococcus M.G agglutination test for primary# atypical pneumonia. o Weil - Felix reaction for typhus fever. o Paul Bunnell test for 1MN. 0 VDRL", 'role': 'assistant'}]