This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Concept of health and disease, Subject name: Social & Preventive Medicine
[{'content': 'Disease described as "Silent Epidemic" of the century \nSelect and explain. \nA. Ischeamic hea disease, B. Road traffic accident, C. Alzheimers disease, D. Obesity', 'role': 'user'}, {'content': "Answer: C \nExplanation: Alzheimer's was considered as silent epidemic of the century. Ref : Park 23rd edition Pgno : 45", 'role': 'assistant'}]