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
'Silent epidemic' of the century is: 
Select and explain. 
A. Coronary artery disease, B. Chronic liver disease, C. Chronic obstructive lung disease, D. Alzheimer's disease
D: Alzheimer's disease
Answer: D: Alzheimer's disease 
Explanation: Ans. (d) Alzheimer's disease* 'Silent epidemic' of last century: Alzheimer's diseaseALSO REMEMBER* Modem epidemic: Coronary heart disease* Most important discovery of 20th century: ORS