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 pertussis - \nSelect and explain. \nA. Neurological complication rate of DPT is 1 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: Pertussis (Whooping Cough):\n\nLeukocytosis does not correlates with the severity of cough\nDrug of choice: Erythromycin (40 mg/kg QID X 10 days)\n\nVaccines:\n\nDPT:\n\ni. Killed acellular bacilli 20,000 million per dose (0.5 ml)\nii. Pertussis component leads to neurological complications after 2 years of age (@ 1 per 1,70,000 vaccinees)\niii. Vaccine efficacy is 50 – 60 % (2 doses) and 70% (3 doses)\nPertussis killed whole cell vaccine\n\nDOC for cases and contacts: Erythromycin (for 10 days)', 'role': 'assistant'}]