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
Type 1 A is characterized by- 
Select and explain. 
A. High anion- gap acidosis, B. Low serum potasium, C. hyperkalemia, D. Negative urine anion gap
B: Low serum potasium
Answer: B: Low serum potasium 
Explanation: Type 1A-classical distal A Hypokalemia Low urine ammonium excretion Non AG acidosis High urine Ph Many of them have hypocitrauria, hypercalciuria ,so nephrocalcinosis, nephrolithiasis and bone disease are common . renal stones Ref:HARRISON 20th edition pg. No. 320