This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Systemic Bacteriology Pa 1 (Gram Positive Cocci, Gram Negative Cocci), Subject name: Microbiology
[{'content': 'Ideal dose of Diptheria antitoxin given for treatment is: \nSelect and explain. \nA. 10,000 to 1,00,000 units, B. 20,000 to 1,00,000 units, C. 10,000 to 2,00,000 units, D. 20,000 to 2,00,000 units', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Diphtheria antitoxin - Should be given immediately when diptheria is suspected as fatality rate increases with delay in staing antitoxin treatment. The recommended dose is 20000 to 100000 units for serious cases Diphtheria antibody titer considered as optimally protective is>0.1 IU/mL.', 'role': 'assistant'}]