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: Pathology
ALL L3 morphology is a malignancy arising from which cell lineage - 
Select and explain. 
A. Mature B cell, B. Precursor B cell, C. Immature T cell, D. Mixed B cell & T cell
A: Mature B cell
Answer: A: Mature B cell 
Explanation: • Acute Lymphoblastic Leukemias (ALL) of the L3 (FAB) subtype are tumors of Mature B-cells (e.g. Burkitt’s lymphoma)