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: Surgery
[{'content': "Randall's plaques causes - \nSelect and explain. \nA. Bile stones, B. Urinary stones, C. Premalignant lesions, D. Bacterial infections", 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Urinary stones", 'role': 'assistant'}]