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: Medicine
[{'content': 'All are features of renal tubular acidosis type I except- \nSelect and explain. \nA. Stone in kidney, B. No anion gap, C. Hypokalemia, D. Fanconi syndrome', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Type1A-classical distal A include- hypoklaemia non-anion gap metabolic acidosis , low urine ammonium excretion, high urine PH. Most of them also have hypocitrauria, hypercalciuria, so nephrolithiasis nephrocalcinosis and bone disease are common. Type2A-proximal A( FANCONI SYNDROME) -generalized proximal tubular dysfunction resulting in Glycosuria Phosphaturia Generalized aminoaciduria Type3A-rare Type4A-generalized distal A Hyperkalemia Decreased ammonia excretion . Many patients have hyporeninemic hypoaldosteronism causing non anionic gap metabolic acidosis . Ref:HARRISON 20th edition pg no. 320', 'role': 'assistant'}]