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
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 
Select and explain. 
A. Subleukemicleukemia, B. Agranulocytosis, C. Infectious mononucleosis, D. Leukoerythroblasticanemia
B: Agranulocytosis
Answer: B: Agranulocytosis 
Explanation: None