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
The changes occuring in the disease frequency over many years is called 
Select and explain. 
A. Cyclic trend, B. Seasonal trend, C. Secular trend, D. None of the above
C: Secular trend
Answer: C: Secular trend 
Explanation: . long term or secular trends implies changes in the occurrence of disease over a long period of time.generally several years or decades.a secular trend implies a consistent tendency to change in a paicular direction or a definitive movement in one direction. ref:park&;s textbook,ed 22,pg no 63