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': 'Following reactions are produced by heterophile antigens, except \nSelect and explain. \nA. Forssman antigen antibody reaction, B. Weil-Felix reaction, C. Paul bunnel reaction, D. Widal reaction', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]