This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteria, Subject name: Microbiology
[{'content': 'Xavier and Yogender stay in the same hostel of same university, Xavier develops infection due to group B meningococcus. After few days Yogender develops infection due to Group - C meningococcus. All the following are true statement except: \nSelect and explain. \nA. Educate students about meningococcal transmission and take preventive measures, B. Chemoprophylaxis to all against both group B and group C, C. Vaccine prophylaxis of contacts of Xavier, D. Vaccine prophylaxis of contacts of Yogendra', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. is \'c\' i.e., Vaccine prophylaxis of contacts of Xavier style="font-size: 1.04761904761905em; font-family: Times New Roman, Times, serif">Ref: For Group B Meningococci no vaccine is available as polysacchride capsule of Group B is poorly immunogenic and it is also encephalitogenic due to cross reactive antigen on neural cells.* But recently FDA has approved Serogroup B meningococcal vaccines (Recombinant) - (Bexsero- and Trumenba-. These two, newly licensed serogroup B meningococcal vaccines are an important step forward for controlling serogroup B meningococcal disease, especially in outbreak settings. For outbreaks caused by serogroup B meningococcal disease, vaccination with a serogroup B meningococcal vaccine is recommended for those 10 years or older identified as being at increased risk because of the outbreak.', 'role': 'assistant'}]