<prompt> The drug which is a specific inhibitor of the enzyme alcohol dehydrogenase and is useful in the treatment of methanol and ethylene glycol poisoning is:DisulfiramEthylene glycolCalcium leucovorinFomepizole  <response>: Fomepizole 4-methylpyrazole is a specific inhibitor of alcohol dehydrogenase and the drug of choice for methanol poisoning by retarding its metabolism. A loading dose of 15 mgkg i.v. followed by 10 mgkg every 12 hours till serum methanol falls below 20 mgdl, has been found effective and safe. It has several advantages over ethanol, viz. longer t 12 and lack of inebriating action, but is not available commercially in India. 