This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lukemia, Subject name: Pathology
Which variety of AML is associated with good prognosis - 
Select and explain. 
A. MO, B. M3, C. M6, D. M7
B: M3
Answer: B: M3 
Explanation: Ans. is 'b' i.e., M3 Prognostic factors in AMLGood PrognosisBad Prognosiso Age < 40 yearso Age < 2 years or > 55 yearso M2, M3, M4 forms of AMLo M0, M6, M7 FORMS OF AMLo Blast cell with Auer rodso Complex karyotypeso TLC <25x109/Lo TLC> 100 x 109/Lo t (15;17), t (8;21), inv 16o Deletions 5q, 7q (Monosomy 5 or 7)o Leukemia without preceeding MDSo AML with preceding MDS or anticancer drug exposure