This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'Which of the following surface glycoproteins is most often expressed in human hematopoietic stem cells \nSelect and explain. \nA. CD22, B. CD40, C. CD15, D. CD34', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ref Robbins 7/e p670; 9/e p590 CD34 is expressed on pluripotent hematopoietic stem cells and progenitor cells of many lineages', 'role': 'assistant'}]