This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Infectious Disease Epidemiology, Subject name: Social & Preventive Medicine
[{'content': 'Endemic disease is defined as - \nSelect and explain. \nA. Disease occuring regularly in expected frequency, B. Disease occuring irregularly, C. Disease occuring in excess of expected freqency, D. Disease affecting a large population', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Disease occuring regularly in expected frequency Sporadic - Disease occuring irregularly from time to time.Endemic - Disease occuring regularly in expected frequency.Epidemic - Disease occuring in excess of expected frequency.Pandemic - Epidemic affecting a large proportion of population over a wide geographic area.", 'role': 'assistant'}]