This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable diseases, Subject name: Social & Preventive Medicine
[{'content': 'True about epidemiology of influenza - \nSelect and explain. \nA. Asymptomatic seen rarely, B. Incubation period 10-12 hrs, C. Pandemic rare, D. All ages sex are equally affected', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Influenza is characterised by sudden onset of chills,malaise, fever, muscular pains and cough Influenza A strain is pandemic IP period l8 to 72 hours Affects all ages andboth sexes Reference : Park&;s Textbook of preventive and social medicine, 24th edition.Pg no. 163,164', 'role': 'assistant'}]