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': 'A 24 year old male complained of recurrent attacks of sore throat since 2 years. The total leucocyte count was 3000/ μl. A differential count revealed severe neutropenia. The diagnosis is \nSelect and explain. \nA. Subleukemicleukemia, B. Agranulocytosis, C. Infectious mononucleosis, D. Leukoerythroblasticanemia', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]