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: Social & Preventive Medicine
[{'content': 'Dietary fibre above which level is considered harmful to humans? \nSelect and explain. \nA. 30 g, B. 40 g, C. 50 g, D. 60 g', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Intake of dietary fibres in excess of 60 g per day can reduce nutrient absorption and cause bowel irritation. Ref: Park 22nd edition, page 569', 'role': 'assistant'}]