This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urinary bladder, Subject name: Surgery
[{'content': 'Which of the following is false regarding endemic bladder stones? \nSelect and explain. \nA. Always associated with recurrence, B. High incidence in cereal based diet, C. Peak incidence in 3 years old children in India, D. Most common type is ammonium urate or calcium oxalate', 'role': 'user'}, {'content': 'Answer: A \nExplanation: PRIMARY BLADDER CALCULI (ENDEMIC BLADDER CALCULI) Mainly seen in underdeveloped countries (Noh Africa, Thailand, Myanmar, Indonesia), in pediatric age group. Most common in children <10 Years, with a peak incidence at 2 to 4 years of age. Related to chronic dehydration and low protein, low phosphate, exclusive milk & high carbohydrate diet. Low phosphate diet Increases urinary ammonium excretion leading to ammonium urate stones Treatent Small stones: Removed or crushed transurethral electrohydraulic lithotripsy or Cystolithotomy. Primary bladder calculi rarely recur after treatment.', 'role': 'assistant'}]