This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable diseases, Subject name: Social & Preventive Medicine
[{'content': 'In a case of meningitis, Neisseria meningitides was grown in culture after 48 hours. Which measure is to be taken immediately? \nSelect and explain. \nA. Isolation of contacts, B. Antibiotic treatment of contacts, C. Vaccination of contact, D. All of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Meningococcal Meningitis prevention and control: Treatment of case Antibiotics staed <48 hours of illness save 95% lives Drug of choice: Penicillin (Ceftriaxone if allergic to penicillin) Epidemics: Single dose Long-acting Chloramphenicol or Ceftriaxone. Treatment of Carriers: Rifampicin Treatment of contacts: Sta treatment <24 hours of identification of index case Drugs used: Rifampicin, Ciprofloxacin, Ceftriaxone, Azithromycin Ref: Park 25th edition Pgno: 179', 'role': 'assistant'}]