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
Disease described as "Silent Epidemic" of the century 
Select and explain. 
A. Ischeamic hea disease, B. Road traffic accident, C. Alzheimers disease, D. Obesity
C: Alzheimers disease
Answer: C: Alzheimers disease 
Explanation: Alzheimer's was considered as silent epidemic of the century. Ref : Park 23rd edition Pgno : 45