This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Haematology, Subject name: Pathology
Which of the following surface glycoproteins is most often expressed in human hematopotetic stem cell? 
Select and explain. 
A. CD22, B. CD4D, C. CD15, D. CD34
D: CD34
Answer: D: CD34 
Explanation: HSC express a variety of cell surface proteins such as CD34 and adhesion proteins which helps cells to home to the bonemarrow when infused Reference : Harsh Mohan textbook of pathology, 7th edition.Pg no.262