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': 'Percentage of renal stones which are radio opaque: \nSelect and explain. \nA. 10%, B. 25, C. 75%, D. 90%', 'role': 'user'}, {'content': 'Answer: D \nExplanation: 90% Of renal stones are radio opaque\n90% of gall stones are radiolucent.', 'role': 'assistant'}]