This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
[{'content': 'According to International Health Regulations, there is no risk of spread of yellow Fever if the Aedes aegypti index remains below \nSelect and explain. \nA. 5%, B. 1%, C. 10%, D. 8%', 'role': 'user'}, {'content': 'Answer: B \nExplanation: International Health Regulations (IHRs) of WHO covers 7 diseases:\n\n– Cholera\n– Plague\n– Yellow Fever\n– Smallpox\n– Wild Polio Virus\n– Human Influenza\n– SARS\n\nInternational measures to restrict the spread of Yellow Fever (IHRs):\n\n– Travellers:\n- Must possess a valid International certificate of vaccination (validity 10days – 10yrs) against YF before they\xa0enter ‘YF receptive areas’\n- If no such certificate available: Quarantine for 6 days (Max I.P of YF) from date of leaving an infected area\n- If traveller arrives before certificate becomes valid (10 days after vaccination): Isolate till it becomes valid\nMosquitoes:\n- Aircrafts/ships arriving from endemic areas: Aerosol spray to kill insect vectors\n- Airports/ seaports kept free from vector breeding: at least 400 meters around boundary\n- Aedes aegypti index: kept below 1%', 'role': 'assistant'}]