Oxalic acid crystals in urine are seen after ingestion of which substance?

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Multiple Choice

Oxalic acid crystals in urine are seen after ingestion of which substance?

Explanation:
Ethylene glycol poisoning leads to calcium oxalate crystals in urine. When ethylene glycol is ingested, it is metabolized by alcohol dehydrogenase to glycolaldehyde, then to glycolic acid and eventually oxalic acid. Oxalate combines with calcium to form calcium oxalate crystals that are excreted in the urine, a hallmark of this exposure. Other alcohols don’t produce these crystals: methanol is converted to formic acid and causes acidosis and optic toxicity, while acetone and isopropyl alcohol are ketones and do not yield calcium oxalate crystals in urine.

Ethylene glycol poisoning leads to calcium oxalate crystals in urine. When ethylene glycol is ingested, it is metabolized by alcohol dehydrogenase to glycolaldehyde, then to glycolic acid and eventually oxalic acid. Oxalate combines with calcium to form calcium oxalate crystals that are excreted in the urine, a hallmark of this exposure. Other alcohols don’t produce these crystals: methanol is converted to formic acid and causes acidosis and optic toxicity, while acetone and isopropyl alcohol are ketones and do not yield calcium oxalate crystals in urine.

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