This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Social & Preventive Medicine
[{'content': 'Which one of the following is not associated with risk of cancer \nSelect and explain. \nA. Smoking, B. Alcohol, C. Chewing betel, D. Excess fibre', 'role': 'user'}, {'content': 'Answer: D \nExplanation: (D) Excess fibre', 'role': 'assistant'}]