This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Childhood Tumors, Subject name: Pediatrics
[{'content': 'Most common malignant tumour in childhood: \nSelect and explain. \nA. Rhabdomyosarcoma, B. Leukaemia, C. Lymphangioma, D. Neuroblastoma', 'role': 'user'}, {'content': "Answer: B \nExplanation: (Leukemia) (561-G) (580 -Ghai 7th)* Leukemia is most common form of childhood malignancy* Descending order - Leukemia > Brain tumour > Lymphoma > Neuroblastoma > Wilm's tumour > Soft tissue sarcoma.* Most common cancer in children (1686-Nelson 17th)* Lymphohematopoietic (44%) > Nervous system (29%) > Embryoral (12%0 > Connective tissue (10%)", 'role': 'assistant'}]