This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Kidney Stones & Renal Tubular Acidosis, Subject name: Medicine
All are true about Renal tubular acidosis except. 
Select and explain. 
A. Impaired acid production, B. Impaired bicarbonate resorption, C. Inability to acidify urine, D. Nephrolithiasis
A: Impaired acid production
Answer: A: Impaired acid production 
Explanation: *Renal tubular acidosis type 2 is characterized by PCT damage and inability to reabsorb bicarbonate resulting in bicarbonaturia. * The damage to DCT in A 1 leads to an inability to acidify urine due to damage to H+ K+ antipoer * The concomitant calcium loss in urine leads to nephrolithiasis and rickets.