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': 'Most severe pain in ureteric stone is seen in cases of? \nSelect and explain. \nA. Oxalate stones, B. Triple phosphate, C. Cystine stone, D. Uric acid stone', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Oxalate stones", 'role': 'assistant'}]