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: Medicine
AML transformation common in -  a) Aplastic anemia  b) MDS  c) Megakaryocytic thrombocytopenia  d) None 
Select and explain. 
A. ab, B. bc, C. d, D. ca
A: ab
Answer: A: ab 
Explanation: None