<prompt> A baby presents with diarrhea and perianal diaper area redness. Diagnosis isLactose intoleranceShigella diarrheaSalmonellaFungal  <response>: In Lactose intolerance, there is a deficiency of the enzyme lactaseSo there is no natural breakdown of lactose - a carbohydrate present in milkThis causes diarrheaThe stool contains reducing sugar which causes perianal excoriationRefer: Nelsons Textbook of Pediatrics, SAE, 1st edition, pg no. 1876 