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': 'Which of the following is the FIRST country to socialize medicine completely? \nSelect and explain. \nA. India, B. Russia, C. USA, D. Germany', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Russia is the first country to socialize medicine completely and to give all its citizens a constitutional right to health services. Ref: Park, 21st Edition, Page 9.', 'role': 'assistant'}]