This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Diagnostic procedures, Subject name: Pathology
Most specific marker for myeloid series is 
Select and explain. 
A. CD 34, B. CD 45, C. CD 99, D. CD 117
D: CD 117
Answer: D: CD 117 
Explanation: The markers for myeloid series are CD13, CD33, CD 11b, CD15, CD117 and cMPO. c MPO is the most lineage specific marker amongst these. Regarding other options, CD 34 - Myeloid and lymphoid blasts, stem cells, CD 45 - Leukocyte common antigen (nonerythroid hematopoietic cells), CD 99 - Ewing's sarcoma/primitive neuroectodermal cells.