This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
[{'content': 'Lactose intolerance is due to ? \nSelect and explain. \nA. Deficiency of Galactokinase, B. Deficiency of Uridyl transferase, C. Deficiency of Lactase, D. Deficiency of Enteropeptidase', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Deficiency of Lactase Lactose intoleranceIt occurs due to deficiency of lactase, the most impoant member of b-galactosidase enzymatic class.Lactase hydrolyses lactose into glucose and galactose in the small intestine.Lactose is present in milk.Therefore, deficiency of lactase, (b-galactosidase) results in intolerance to milk and other dairy products.Clinical features are bloating, diarrhea, failure to thrive, abdominal distension and abdominal cramp.", 'role': 'assistant'}]