Biochemistry Asians & native americans may flush & feel ill after drinking small amount of ethanol. This reaction is due to genetic variation in which enzyme: A Alcohol dehydrogenase B Aldehyde dehydrogenase C Isocitrate dehydrogenase D Alpha-keto glutarate dehydrogenase 💡 Explanation Asians & native americans may flush & feel ill after drinking small amount of ethanol. This reaction is due to genetic variation in which enzyme: ✓ Correct Answer: B. Aldehyde dehydrogenase