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': 'The TRUE statement regarding tetanus is: \nSelect and explain. \nA. Five dose immunisation provides life long immunity, B. TT affords no protection in the present injury, C. TT serves no use once 12 hours have elapsed following injury, D. TT and Ig may both be given in suspected tetanus', 'role': 'user'}, {'content': "Answer: D \nExplanation: Tetanus is prevented by Active and passive immunization. Active immunization is with tetanus toxoid and passive immunization is with human tetanus hyperimmunoglobulin. Simultaneous active and passive immunization is given in non immune persons. The purpose of antitoxin is for immediate protection and the purpose of toxoid is for long lasting protection. Life long immunity is not achieved by tetanus immunization and a booster every 10 years is required. Ref: Park's Textbook of Preventive and Social Medicine By K. Park, 18th Edition, Pages 248-52", 'role': 'assistant'}]