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: Pathology
[{'content': 'Smoking is not a risk factor for \nSelect and explain. \nA. Lung carcinoma, B. Osteoporosis, C. Nonunion of bones, D. Alzhiemers disease', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Answer- D. Alzhiemers disease"Recent research has shown that smoking is a signifcant risk factor for vascular dementia and Alzheimer\'s disease, with smokers twice as likely to develop the disease as non-smokers".', 'role': 'assistant'}]