This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Misc. (W.B.C), Subject name: Pathology
[{'content': 'A7 year old presents with fever, weight loss. On examination he was pale and had significant lymphadenopathy. Bone marrow histology is as given below. What is the most probable diagnosis? \nSelect and explain. \nA. ALL, B. AML, C. Aplastic anaemia, D. juvenile myelomonocyticleukemia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) ALL(Ref: R 9/611)The picture is that of a lymphoblast. Lymphoblasts will be 3-4x larger than a mature RBC, High nuclear to cytoplasmic ratio, Round Nucleus with immature chromatin (not clumped), Prominent nucleoli, Cytoplasm is scant, light blue and lacks granules', 'role': 'assistant'}]