This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pediatrics
[{'content': 'Most common urinary bladder tumour in childhood is – \nSelect and explain. \nA. Haemangioma, B. Rhabdomyosarcoma, C. Transitional cell carcinoma, D. Squamous cell carcinoma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]