This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urology, Subject name: Anatomy
[{'content': 'A most common tumour of urinary bladder is \nSelect and explain. \nA. Squamous cell carcinoma, B. Adenocarcinoma, C. Stratified squamous carcinoma, D. Transitional carcinoma', 'role': 'user'}, {'content': 'Answer: D \nExplanation: 3 histological types of Bladder cancer are seen transitional cell ca -90% squamous cell ca -5~10% adenocarcinoma - 2%', 'role': 'assistant'}]