This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Renal Tumors, Subject name: Surgery
[{'content': "Commonest presentation of wilm's tumouris \nSelect and explain. \nA. Hematuria, B. Abdomial lump, C. Hydronephrosis, D. Pain in abdomen.", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. is \'b\' ie Abdominal lump "MC presentation is painless abdominal mass usually discovered by the mother while routinely bathing the baby."', 'role': 'assistant'}]