This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
Bone marrow stem cells differ from differentiated progenitor stem cells in what respect? 
Select and explain. 
A. Provide differentiated terminal cells, B. Reconstitution of Bone marrow, C. Formation of the ovum, D. Act as a repair system for the body
B: Reconstitution of Bone marrow
Answer: B: Reconstitution of Bone marrow 
Explanation: None