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': 'After two doses of vaccination against plague, the immunity will last for - \nSelect and explain. \nA. Six months, B. One year, C. Eighteen months, D. Twenty-four months', 'role': 'user'}, {'content': "Answer: A \nExplanation: - the plaque vaccine is killed vaccine. - two doses of 0.5 &1 ml given subcutaneously at interval of 7-14 days. - immunity sta 5-7 days after inoculation and lasts for 6 months. Reference : Park's textbook of preventive and social medicine, 23rd edition, pg no:296 <\\p>", 'role': 'assistant'}]