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: Medicine
All are features of renal tubular acidosis type I except - 
Select and explain. 
A. Stone in kidney, B. No anion gap, C. Hypokalemia, D. Fanconi syndrome
D: Fanconi syndrome
Answer: D: Fanconi syndrome 
Explanation: None