<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:An 18-year-old girl is brought to the emergency department because of a 1-day history of severe headache with photophobia and diffuse myalgias. She is a college student and lives in a dormitory in a large urban area. She has not traveled recently. On arrival, she is lethargic. Her temperature is 39.3C 102.7F, pulse is 120min, and blood pressure is 8858 mm Hg. Examination shows scattered petechiae and ecchymoses on the trunk and lower extremities. There is decreased range of motion of the neck. Cerebrospinal fluid analysis shows a cell count of 1,600μL 80 neutrophils and a lactate concentration of 5.1 mmolL. Which of the following is most likely to have prevented this patients condition?? A: Doxycycline therapy, B: Intravenous vancomycin, C: Polysaccharide conjugate vaccine, D: Toxoid vaccine, E: Erythromycin therapy,  <response>: This is a clinical vignette describing an 18-year-old girl with symptoms and findings consistent with meningococcal meningitis, including high fever, headache, photophobia, myalgias, petechiae, decreased neck range of motion, CSF pleocytosis and elevated lactate. The question asks which of the provided interventions would have been most likely to prevent this condition. Choices A and E refer to antibiotic therapies, which would not be used for prophylaxis against meningitis. Choice B refers to an intravenous antibiotic used to treat meningitis, not prevent it. Choice C refers to the meningococcal polysaccharide conjugate vaccine, which is part of the recommended vaccination schedule for adolescents and would be the most likely intervention to prevent meningococcal disease. Choice D refers to a toxoid vaccine, which is used to prevent diphtheria and tetanus, not meningitis.C: Polysaccharide conjugate vaccine 