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': 'Example of heterophile antigen is ? \nSelect and explain. \nA. Forssman antigen, B. Cryptococcus polysacchoride, C. Protein A of staphylococcus, D. All of the above', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e.,Forssman antigen Heterogenetic (Heterophile) specificitySame or closely related antigens occuring in different biological species, classes and kingdoms are known as heterogenetic or heterophile antigens.", 'role': 'assistant'}]