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
[{'content': 'B ALL is due to- \nSelect and explain. \nA. T cells, B. Immature B cells, C. Immature T cells, D. Both T & B cells', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 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', 'role': 'assistant'}]