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': 'Which of the following diseases is known as the "kissing\ndisease": \nSelect and explain. \nA. Acquired immunodeficiency syndrome (AIDS), B. Infectious mononucleosis, C. Primary syphilis, D. Recurrent apthous stomatitis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]