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': 'Cystinuria all of the following amino acids are excreted, except: \nSelect and explain. \nA. Cystine, B. Ornithine, C. Leucine, D. Arginine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ref. Textbook of Biochemistry for Medical Students. Page. 283\n\xa0\nCystinuria is an inherited metabolic disorder characterized by the abnormal movement (transport) in the intestines and kidneys, of certain organic chemical compounds (amino acids).\n\nThese include cystine, lysine, arginine, and ornithine. \nExcessive amounts of undissolved cystine in the urine (cystinuria) cause the formation of stones (calculi) in the kidney\n\nSubtypes of cystinuria \n\nType I cystinuria, there is a defect in the active transport of cystine and the amino acids (dibasic) lysine, arginine, and ornithine in the kidneys and small intestine.\nType II cystinuria, cystine and lysine transport is severely impaired in the kidneys and only somewhat impaired in the intestines\nType III cystinuria, kidney transport of cystine and lysine is defective; intestinal transport is normal', 'role': 'assistant'}]