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
Stem cells are taken from ? 
Select and explain. 
A. Skin, B. Bone marrow, C. Oral mucosa, D. Elementary tract
B: Bone marrow
Answer: B: Bone marrow 
Explanation: Stem cells are undifferentiated pluripotent cells. They are present in bone marrow of adults. Basic Pathology, Robbins. Page no.:60