This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Haematology, Subject name: Medicine
Flowcytometry of an AML patient showed CD41 and CD61 positivity, it belongs to which FAB classification? 
Select and explain. 
A. M0, B. M3, C. M5, D. M7
D: M7
Answer: D: M7 
Explanation: Acute megakaryoblastic leukaemia can often be diagnosed only by expression of the platelet-specific antigens CD41 and/or CD61.It is classified under the AML-M7 category of the FAB classificationRef: Harrison 19th edition pg: 678