This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Kidney, Subject name: Pediatrics
[{'content': 'A 9-years-old female child presented with polyuria, polydipsia and metabolic acidosis. On slit lamp examination crystal deposits are seen in cornea. What is the diagnosis? \nSelect and explain. \nA. Cystinuria, B. Cystinosis, C. Cystothioninuria, D. Homocysteinuria', 'role': 'user'}, {'content': 'Answer: B \nExplanation: b. Cystinosis(Ref: Nelson 20/e p 2529-2530)Features of renal tubular dysfunction like polyuria, polydipsia and metabolic acidosis, along with presence of crystal deposits in cornea on slit lamp examination of eye suggest a diagnosis of Cystinosis', 'role': 'assistant'}]