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
ALL , 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
D: Mixed B cell & T cell
Answer: D: Mixed B cell & T cell 
Explanation: Acute Lymphoblastic Leukemia/ Lymphoma (ALLs) are neoplasms composed of immature B ( pre-B) or T(pre-T) cells ,which are referred to as lymphoblasts. Ref :Robbins pathologic basis of disease ; south east asia edition ;pg:590