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
Retention of mature neutrophils in bone marrow is known as: 
Select and explain. 
A. Myelokathesis., B. Myelocytosis, C. Leukocytosis, D. Leukemia
A: Myelokathesis.
Answer: A: Myelokathesis. 
Explanation: None