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: Pathology
B ALL is due to- 
Select and explain. 
A. T cells, B. Immature B cells, C. Immature T cells, D. Both T & B cells
B: Immature B cells
Answer: B: Immature B cells 
Explanation: ALL are neoplasms composed of immature B (pre B) or T ( pre T) cells which are referred to as lymphoblasts. About 85% are B ALLs which typically manifest as childhood acute leukemias Ref: Robbins and Cotran Pathologic basis of disease.South Asia Edition volume 1.page no,.590