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: Pathology
[{'content': 'Paul -Bunnell test is positive in: \nSelect and explain. \nA. Infectious mononucleosis, B. Multiple myeloma, C. Malignant nerves, D. Rubella', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]