<prompt> Xavier and Yogender stay in the same hostel of the same university. Xavier develops infection with Group B meningococcus. After a few days, Yogender develops infection due to Group C meningococcus. All the following are true statements exceptVaccine prophylaxis of contacts of XavierEducate students about meningococcal transmission and take preventive measuresChemoprophylaxis against both Group B and Group CVaccine prophylaxis of contacts of Yogender  <response>: No vaccine prophylaxis can be given to contacts of Xavier as there is no effective vaccine available for Group B Meningococcus. 