This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Toxicology, Subject name: Medicine
Oxalate crystals in urine is seen in: (PGI Dec 2006) 
Select and explain. 
A. Ethylene glycol poison, B. Di glycol poison, C. Alcohol, D. Indinavir
A: Ethylene glycol poison
Answer: A: Ethylene glycol poison 
Explanation: Ans: A (Ethylene glycol poisoning) Ethylene Glycol Poisoning# Ingestion of ethylene glycol (commonly used in antifreeze) leads to a metabolic acidosis and severe damage to the central nervous system, heart, lungs, and kidneys. The increased AG and osmolar gap are attributable to ethylene glycol and its metabolites, oxalic acid, glycolic acid, and other organic acids. Lactic acid production increases secondary to inhibition of the tricarboxylic add cycle and altered intracellular redox state.# Diagnosis is facilitated by recognizing oxalate crystals in the urine(r) the presence of an osmolar gap in serum, and a high-AG acidosis. If anti freeze containing a fluorescent dye is ingested, a Wood's lamp applied to the urine may be revealing. Treatment should not be delayed while awaiting measurement of ethylene glycol le%rels in this setting