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': 'The active immunity offered by tetanus toxoid is effective in nearly - \nSelect and explain. \nA. 25% of the patients, B. 50% of the patients, C. 75 % of the patients, D. 100% of the patients', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The aim of active immunisation with tetanus toxoid is to vaccinate the entire community and ensure a protective level of antitoxin approximately 0.01 IU/ml serum throughout life Reference; Park&;s Textbook of preventive and social medicine, 24th edition.Pg no. 330', 'role': 'assistant'}]