This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Social & Preventive Medicine
[{'content': 'Global eradication of smallpox was done on: \nSelect and explain. \nA. 26th Oct 1977, B. 8th May 1980, C. 17th March 1980, D. 17th April 1977', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (b) 8th May 1980* Last indigenous case of Smallpox in India: 77th May 1975* Last case of Smallpox in India: 24th May 1975* India declared Smallpox-free: 23 April 1977* Last case of Smallpox globally: 26th October 1977 (Somalia)* Actual last case of smallpox : 1978* Global eradication of Smallpox: 8th May 1980', 'role': 'assistant'}]