<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A previously healthy 21-year-old college student is brought to the emergency department because of a 10-hour history of increasing headache, stiff neck, and sensitivity to light. He returned from a mission trip to Haiti 3 weeks ago where he worked in a rural health clinic. He appears lethargic. He is oriented to person, place, and time. His temperature is 39C 102F, pulse is 115min, respirations are 20min, and blood pressure is 10070 mm Hg. Examination shows equal and reactive pupils. There are scattered petechiae over the trunk and lower extremities. Range of motion of the neck is decreased due to pain. Neurologic examination shows no focal findings. Blood cultures are obtained and a lumbar puncture is performed. Cerebrospinal fluid CSF analysis shows neutrophilic pleocytosis and decreased glucose concentration. Which of the following is most likely to have prevented this patients condition?? A: Fluconazole therapy, B: Inactivated whole-cell vaccine, C: Toxoid vaccine, D: Polysaccharide conjugate vaccine, E: Erythromycin therapy,  <response>: Based on the clinical presentation of fever, headache, stiff neck, and petechiae, this patient likely has meningitis. The history of recent travel to Haiti and working in a rural health clinic raises suspicion for a bacterial cause. The CSF findings of neutrophilic pleocytosis and low glucose support bacterial meningitis. The question asks which vaccine would have been most likely to prevent this condition. Bacterial meningitis in a previously healthy young adult who traveled to Haiti is most likely caused by Neisseria meningitidis. Conjugate vaccines against N. meningitidis serogroups A, C, W, and Y are recommended for travelers to areas like Haiti where these serogroups are endemic. Therefore, the polysaccharide conjugate vaccine is the best answer.The other options are incorrect. Fluconazole treats fungal infections, not bacterial meningitis. Inactivated whole cell or toxoid vaccines are used for diseases like cholera and tetanus, not meningitis. Erythromycin is an antibiotic that could be used to treat meningitis but would not prevent it.D: Polysaccharide conjugate vaccine 