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: Medicine
[{'content': 'All the following statements are true about pertussis except: \nSelect and explain. \nA. SAR is > 90%, B. There is no Subclinical or Chronic Carrier state, C. Leucocytosis correlates with the severity of cough, D. Doc is erythromycin', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Leucocytosis does not correlate with the severity of cough.', 'role': 'assistant'}]