This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteria, Subject name: Microbiology
[{'content': 'Whooping cough is caused by? \nSelect and explain. \nA. C.dipthera, B. B.pertussis, C. M.catarrhalis, D. S.pneumonea', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. (b) B.pertisusRef: Harrison's 18th ed ch-148", 'role': 'assistant'}]