This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
[{'content': 'An oxidase-positive, gram-negative rod which produces a bluish-green pigment has been grown in culture from a swab obtained from an infected burn wound. This organism is susceptible to gentamicin, ticarcillin and tobramicin, but resistant to all the other antibiotics. Which of the following organisms is it likely to be? \nSelect and explain. \nA. Escherichia coli, B. Klebsiella pneumoniae, C. Proteus mirabilis, D. Pseudomonas aeruginosa', 'role': 'user'}, {'content': 'Answer: D \nExplanation: P. aeruginosa can cause a variety of skin infections, such as infections of burn wound, chronic paronychia, infected toe web, pseudomonal folliculitis, and pseudomonal cellulitis.\nInfection of burn wounds is the most common recognized condition caused by P. aeruginosa. Pseudomonal wound infection is characterized by the presence of dark brown eschar associated with edema and hemorrhagic necrosis.\nPseudomonas are susceptible to cefotaxime, ceftazidime, gentamicin, tobramycin, carbenicillin, azlocillin, and ticarcillin.\nCiprofloxacin is most frequently used antibiotic, because it is active against P. aeruginosa in most tissues. Pseudomonas infections are treated best with combination of at least two anti-pseudomonal antibiotics.\n\nParija SC. Textbook of Microbiology & Immunology. Elsevier Health Sciences; 2014. Page: 316-17', 'role': 'assistant'}]