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': 'H5N1 An Influenza has not become an epidemic till now. What is the most impoant reason for this? \nSelect and explain. \nA. Seen only in wild birds and not in domestic poultry, B. It has an influenza genes, C. Human to Human transmission is rare, D. It causes serious illness leading to death of the patient', 'role': 'user'}, {'content': 'Answer: C \nExplanation: An influenza refers to a large group of different influenza virus that primarly affect birds. The vast majority of an influenza viruses donot infect humans. However an H5N1 is a strain with pandemic potential, since it might ultimately adapt in to a strain that is contagious among human.As this has not occured it cannot become an epidemic.Founately H5N1 virus doesn&;t jump from birds to humans of spread readily and sustainably among humans. Reference; Park&;s Textbook of preventive and social medicine, 24th edition.Pg no. 166', 'role': 'assistant'}]