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 osmolar gap is not seen in poisoning of- 
Select and explain. 
A. Para-aldehyde, B. Acetones, C. Methanol, D. Ethylene glycol
A: Para-aldehyde
Answer: A: Para-aldehyde 
Explanation: Causes of High-Anion Gap Metabolic Acidosis *Lactic acidosis * Toxins *Ketoacidosis * Ethylene glycol Diabetic * Methanol Alcoholic * Salicylates Starvation * Propylene glycol *Pyroglutamic acid (5-oxoproline) *Renal failure (acute and chronic) reference : harrisons principles of internal medicine,19 E , page 318