This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fluid and electrolytes, Subject name: Medicine
Increased 'anion gap' is not seen in - 
Select and explain. 
A. Salicylate poisoning, B. Renal tubular acidosis, C. Lactic acidosis, D. Ethylene glycol poisoning
B: Renal tubular acidosis
Answer: B: Renal tubular acidosis 
Explanation: Causes of High-Anion Gap Metabolic Acidosis *Lactic acidosis *Ketoacidosis Diabetic Alcoholic Starvation *Renal failure (acute and chronic) *toxins: ethylene glycol methanol salicylates propylene glycol pyroglutamic acid (Ref: Harrison's principles of internal medicine,18E , pg 365)