This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: viral infection, Subject name: Medicine
[{'content': 'Why is Covid-19 a major global concern despite the propey of influenza to spread faster than Covid-19 ? \nSelect and explain. \nA. Median incubation period is more in influenza, B. Reproductive number for covid-19 is 2-2.5, C. Serial interval is 5-6 days in influenza, D. Reproductive number for Influenza is more', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Influenza Covid-19 Median incubation period 2 days 5.5 days Serial interval 3 days 5-6 days Moality 0.1% 3% Though Influenza spreads faster than covid 19 but moality and reproductive number is higher for covid-19 due to which it is a disease of global concern . Reproductive number- No. of secondary infections generated from one infected person, which 2-2.5 in case of Covid-19', 'role': 'assistant'}]