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: Physiology
[{'content': 'True about High roughage in diet is : \nSelect and explain. \nA. Decreases stool transit time, B. Increase stool transit time, C. Normalise stool transit, D. No effect on stool transit time', 'role': 'user'}, {'content': 'Answer: D \nExplanation: A i.e. Decreases stool transit time', 'role': 'assistant'}]