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
Which of the following condition is not associated with an increased anion gap? 
Select and explain. 
A. Salicylate poisoning, B. Proximal A, C. Ethylene glycol poisoning, D. Lactic acidosis
B: Proximal A
Answer: B: Proximal A 
Explanation: Both proximal and distal A causes normal anion gap metabolic acidosis. Normal anion gap is 8 - 12 mEq/L. Conditions associated with increased anion gap acidosis are lactic acidosis, ketoacidosis, ingestion of toxins ( alcohol, ethylene glycol, methanol, isopropyl alcohol), acute and chronic renal failure.