This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epidemiology, Subject name: Social & Preventive Medicine
[{'content': 'Which of the following vaccine is given at birth \nSelect and explain. \nA. DPT, B. OPV, C. Measles, D. TAB', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans) b (OPV) Ret Park 20th ed 113Refer National immunization schedule (Kerala 2009 Q155)OPV zero dose is given at birth. Measles vaccination is given at 9 months and DPT 1st dose is given at 6 weeksTAB is a heat killed Typhoid bacillus vaccine which contains 1000 million of S. Typhi and S. Paratyphi A and B 750 million each per ml killed by heating at 50-60 degree Celsius and preserved in 0.5% phenol.', 'role': 'assistant'}]