This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Organ Transplant / Graft, Subject name: Pathology
[{'content': 'True about adult autologous stem cell transplant are all except: \nSelect and explain. \nA. Used in the treatment of leukemia, B. Stem cells are collected directly from the bone marrow, C. G-CSF is given to expand the number of stem cells, D. It allows high dose of chemotherapy', 'role': 'user'}, {'content': "Answer: B \nExplanation: Autologous transplantation involves the removal and storage of the patient's own stem cells with subsequent reinfusion after the patient receives high-dose myeloablative therapy. Unlike allogeneic transplantation, there is no risk of GVHD or graft rejection with autologous transplantation. Donors are typically treated with 4 or 5 days of hematopoietic growth factor, following which stem cells are collected in 4-hour pheresis sessions.", 'role': 'assistant'}]