This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunization, Subject name: Pediatrics
[{'content': 'Protective levels of Tetanus anti-toxin is: \nSelect and explain. \nA. >0.01 IU/mL, B. >0.5 IU/mL, C. >1.0 IU/mL, D. >5 IU/mL', 'role': 'user'}, {'content': "Answer: A \nExplanation: a. >0.01IU/mL(Ref: Nelson's 20/e p 1381, Ghai 8/e p 193-194)Protective titer for diphtheria >0.1IU/mL and for tetanus >0.01IU/mL.", 'role': 'assistant'}]