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: Social & Preventive Medicine
[{'content': 'Which of the following statements is true regarding peussis ? \nSelect and explain. \nA. Neurological complication rate of DPT is I in 50000, B. Vaccine efficacy is more than 95%, C. Erythromycin prevents spread of disease between children, D. The degree of polymorphonuclear Leukocytosis correlates with the severity of cough', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Erythromycin prevents spread of disease between children o Efficacy of Peusis Vaccine - repoed to be from 70-90% o Risk of acute encephalopathy - is 1 in 40, 000 cases following DTP vaccine. o Peusis toxin produces Lymphocytosis & not polymorphonuclear Leukoctyosis. Leukocytosis due to absolute lymphocytosis is characteristic in late catarrhal or paraoxysmal stage. o Prophylactic erythromycin prevents infecting bacteria to become established - prevents spread of disease - Park", 'role': 'assistant'}]