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
Which of the following is not a stem cell of the bone marrow 
Select and explain. 
A. Lymphoblast, B. Myeloblast, C. Myoblast, D. Normoblast
C: Myoblast
Answer: C: Myoblast 
Explanation: Ref Robbins 9/e p580;8/e p85 Bone marrow cells include: hematopoietic stem cells include lymphoblast ,myeloblast and normoblast Marrow stromal cell / multipotent stem cells(MSC) Including myoblast , osteoblast ,chondrocytes, adipocytes and endithelial cell precursor.Myoblast is an example of MSC giving rise to muscle cells or myocytes