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': 'Recommended daily intake of fibre in diet \nSelect and explain. \nA. 20 grams, B. 40 grams, C. 80 grams, D. 100 grams', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]