This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Genetic and genetic disorders, Subject name: Pediatrics
[{'content': 'Features of cystinuria are \nSelect and explain. \nA. Impaired proximal tubular reabsorption of cystin, B. Autosomal recessive, C. Recurrent renal stone, D. All of above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Cystinuria is an autosomal recessive disorder characterized by impaired tubular reabsorption of cystine and dibasic amino acids (ornitine,lysine and arginine) Thus occurs supersaturation of urine with cystine crystals leading to formation of radiopaque calculi . Reference : Ghai TB of pediatrics 8th edition pg 503.', 'role': 'assistant'}]