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: Anatomy
ALL L3 morphology is a malignancy arising from which cell lineage? 
Select and explain. 
A. Mature B xell, B. Precursor Bcell, C. Immature T cell, D. Mixed B cell and T cell
A: Mature B xell
Answer: A: Mature B xell 
Explanation: Acute lymphoblastic leukemias of the L3 subtype are tumors of Mature B cell ( ref Robbins 7th /677,9th/590)