This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hematopoeisis: Basic concepts, Subject name: Pathology
[{'content': 'Which of the following surface glycoproteins is most often expressed in human hematopoietic stem cell (HSC)? \nSelect and explain. \nA. CD23, B. CD30, C. CD33, D. CD34', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Surface antigen/Marker Normal cellular distribution CD34 Pluripotent hematopoietic stem cells & progenitor cells of many lineages. CD23 Activated mature B cells CD30 Activated B cells, T cells, and monocytes; Reed-Sternberg cells and variants CD33 Myeloid progenitors and monocytes', 'role': 'assistant'}]