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
Dietary fibre above which level is considered harmful to humans? 
Select and explain. 
A. 30 g, B. 40 g, C. 50 g, D. 60 g
D: 60 g
Answer: D: 60 g 
Explanation: 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