This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gastrointestinal System, Subject name: Physiology
[{'content': 'Which disaccharide is not broken down into GIT by enzymatic action: \nSelect and explain. \nA. Lactulose, B. Lactose, C. Sucrose, D. Isomaltose', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Lactulose is nonabsorbable carbohydrate', 'role': 'assistant'}]