This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology, Subject name: Microbiology
Which is not a heterophile agglutination test - 
Select and explain. 
A. Weil Felix test, B. Widal test, C. Paul Bunnel test, D. Streptococcus MG
B: Widal test
Answer: B: Widal test 
Explanation: Widal test is a tube agglutination test for the diagnosis of typhoid. Weil- Felix reaction for the diagnosis of typhus fever , streptococcus MG agglutination test for diagnosis of primary atypical pneumonia, Paul - Bunnell test for diagnosis of infectious mononucleosis aishheterophileagglutination test. The heterophile antigen is the same or closely related antigens occurring in different species, classes or kingdoms. Reference : Anathanarayan & paniker's 9th edition, pg no:109,89 <\p>