This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Blood, Subject name: Pathology
According to FAB classification, the minimum blast cells for diagnosis of AML are 
Select and explain. 
A. 20, B. 30, C. 10, D. 40
B: 30
Answer: B: 30 
Explanation: (30): (362- Harsh mohan 6th edition)* According to revised FAB classification system a leukaemia is acute if the bone marrow consist of more than 30% blasts* WHO classification for AML has revised and lowered the cut of percentage of marrow blasts to 20% from 30% in the FAB classification for making the diagnosis of AML