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
[{'content': 'The changes occuring in the disease frequency over many years is called \nSelect and explain. \nA. Cyclic trend, B. Seasonal trend, C. Secular trend, D. None of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: . 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', 'role': 'assistant'}]