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: Unknown
[{'content': 'Chronic Laxative abuse can result in the formation of which type of stone: \nSelect and explain. \nA. Xanthine, B. Cysteine, C. Ammonium urate, D. Struvite', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ref. API Textbook of Medicine. Pg. 784\n\xa0\nUrinary stones due to chronic laxative abuse is due to gastrointestinal loss of fluid and electrolytes leads to chronic depletion of urinary volume ,relative super saturation and many other pathophysiologic derangements .\nThese calculi are generally radiolucent with uric acid and ammonium urate as major componenent.', 'role': 'assistant'}]