This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: CLL & CML, Subject name: Medicine
Which of the following has the least 5 year survival rate following allogenic bone marrow transplantation? 
Select and explain. 
A. Severe Combined Immunodeficiency state, B. Aplastic Anemia, C. Blast crisis in CML, D. Chronic lymphocytic leukaemia
C: Blast crisis in CML
Answer: C: Blast crisis in CML 
Explanation: Blast crisis in CML has the least 5 year survival rate following allogenic bone marrow transplantation. 5 year Survival rate after bone marrow transplantation: A.M.L 40-60% A.L.L 40-50% C.M.L Chronic phase 70% C.M.L Blast crisis 15% C.L.L 50% N.H.L 40% SCID, Aplastic Anaemia, Thalassemia 90%