This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
[{'content': 'Which of the following stem cell population are found in bone marrow except \nSelect and explain. \nA. Endothelial progenitor cells, B. Myoblast progenitor cells, C. Mesenchymal stem cells, D. Hematopoetic stem cells', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Myoblast progenitor cells are indirectly derived from mesenchymal stem cells', 'role': 'assistant'}]