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MBBS QUESTION #10304
Question 1
A patient develops bloating, flatulence, and osmotic diarrhea after consuming dairy products. This is most consistent with deficiency of which brush-border enzyme, which normally hydrolyzes lactose into glucose and galactose?
  • Sucrase
  • Lactase✔️
  • Maltase
  • Amylase
Correct Answer Explanation
Lactase deficiency (common in adults of many populations after weaning) prevents hydrolysis of the disaccharide lactose; undigested lactose passes into the colon where bacterial fermentation produces gas and an osmotic load, causing the classic symptoms of lactose intolerance.