This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Microbiology
[{'content': 'Two girls in the same class are diagnosed with meningococcal meningitis Their 12 yr old close friend is in fear of contracting dis what advice should be given to her \nSelect and explain. \nA. Two doses of polysaccharide vaccine, B. Two doses of conjugate vaccine, C. Single dose of meningococcal vaccine, D. No vaccine needed as exposure has already occurred', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Meningococcal conjugate vaccine mcv 4 have new largely replaced meningococcal polysaccharide vaccine Mps in prevention of meningococcal dis CDC recommends that all adolescents should recieve meninegiococcal conjugate vaccine MCV 4 IM =1stdose at 12 12 years and booster at 16 years ref : ananthanaryana', 'role': 'assistant'}]