This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of Amino Acids, 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: Ans. is 'd' i.e., All of above Cystineuriao Metabolic disorder of autosomal recessive inheritance.o Defect in transport of cystine and some other aminoacid across renal tubular ceil & interstitial cell,o Selective increase renal clearance of cystine and other basic aminoacid in urine.o High urinary cystine leads to radio - opaque hexagonal crystal,o Crystal is soluble in alkali.o Treatment - formation of stone can be reduced by alkalization of urine.", 'role': 'assistant'}]