This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epidemiology, Subject name: Social & Preventive Medicine
Secular trend is shown by - 
Select and explain. 
A. Epidemics of measles, B. Coronary heart disease, C. Dengue fever, D. All of the above
B: Coronary heart disease
Answer: B: Coronary heart disease 
Explanation: Ans. is 'b' i.e., Coronary heart disease * The term secular trend implies changes in the occurrence of disease over a long period of time, generally several years or decades. There may be progressive increase or decrease in the occurrence of disease.* Examples -i) CHD, lung cancer, and DM have shown a consistent upward trend in developed countries.ii) TB, typhoid fever, diphtheria and polio have shown a declined trend in developed countries.