This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Kidney and ureter, Subject name: Surgery
[{'content': "Commonest presentation of Wilm's tumour is: \nSelect and explain. \nA. Hematuria, B. Abdominal lump, C. Hydronephrosis, D. Pain in abdomen", 'role': 'user'}, {'content': "Answer: B \nExplanation: WILMS TUMOR Wilm's Tumor: MC primary renal tumor of childhood (2-5 Years) Wilm's Tumor: 2nd MC malignant abdominal tumor in children (MC is neuroblastoma). Arise from kidney, composed of three elements- Blastema, Epithelium & Stroma. (BESt) MC presenting feature is asymptomatic abdominal mass or swelling.", 'role': 'assistant'}]