<prompt> Asians native americans may flush feel ill after drinking small amount of ethanol. This reaction is due to genetic variation in which enzyme:Alcohol dehydrogenaseAldehyde dehydrogenaseIsocitrate dehydrogenaseAlpha-keto glutarate dehydrogenase  <response>: Genetic variation occurs in enzyme aldehyde dehydrogenase, specially in people of China, Korea native America, known as Asian flush syndrome. Increased acetaldehyde causes:- Nausea Vomiting Flushing Sweating Tachycardia hyperventilation ADDITIONAL READING ON ALCOHOL DEHYDROGENASE ADH: There are many isoenzymes Most abundant - ADH-1A Present in cytoplasm of liver and adrenal glands Has NAD containing domain known as Rossman fold 