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: Unknown
All of the following acute myeloid leukemia are diagnosed regardless of blast count except 
Select and explain. 
A. AML with t(8;21), B. AML with t(15;17), C. AML with t(16;16), D. AML with t(1;9)
D: AML with t(1;9)
Answer: D: AML with t(1;9) 
Explanation: WHO classification mandates diagnosis of AML only when >20% blasts are present in the marrow. However, in the following three scenarios, this is overruled and AML may be diagnosed even if blast count is <20%.

AML with t(8;21)
AML with t(15;17)
AML with inv (16) or t(16;16)