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: Microbiology
[{'content': 'True regarding pertussis vaccine is - \nSelect and explain. \nA. 95% of vaccinated are protected, B. Erythromycin should be given to contacts, C. Neuroparalytic Complication is seen in 1 in 15000, D. Leucocytosis is diagnostic', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]