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': 'All the following are Heterophile agglutination tests except \nSelect and explain. \nA. Paul Bunnell test, B. Weil felix reaction, C. Cold agglutination test, D. Widal test', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Widal test is just a agglutination test.', 'role': 'assistant'}]