<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A neonate appears irritable and refuses to feed. The patient is febrile and physical examination reveals a bulge at the anterior fontanelle. A CSF culture yields Gram-negative bacilli that form a metallic green sheen on eosin methylene blue EMB agar. The virulence factor most important to the development of infection in this patient is:? A: Exotoxin A, B: LPS endotoxin, C: Fimbrial antigen, D: IgA protease, E: K capsule,  <response>: This is a clinical vignette describing a neonate with signs and symptoms of meningitis, including irritability, fever, bulging fontanelle, and positive CSF culture. The description of Gram-negative bacilli that form a metallic green sheen on EMB agar is characteristic of Klebsiella pneumoniae. Klebsiella meningitis in neonates is often caused by K. pneumoniae strains expressing the K1 or K2 capsule serotypes. The K capsule is an important virulence factor that helps the bacteria evade phagocytosis and complement-mediated killing, allowing it to survive in the bloodstream and cross the blood-brain barrier to cause meningitis.Of the answer choices provided, the K capsule best matches the key virulence factor for this clinical scenario involving neonatal Klebsiella meningitis.E: K capsule 