This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacterial infections, Subject name: Dental
[{'content': 'Ecthyma gangrenosum seen in? \nSelect and explain. \nA. Pseudomonas septicemia, B. Lepromatous leprosy, C. Ulcerative colitis, D. All of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ecthyma Deeper variant of impetigo Indurated lesion with necrotic crust=on removal=forms ulcer Three types Ecthyma gangrenosum - Pseudomonas aeruginosa Ecthyma pyogenicum - Strep, Staph aureus Ecthyma contagiosum / Contagious pustular disease / Orf disease - Parapox virus/ORF virus. It is zoonotic viral condition which spreads sheep goat. Pseudomonas septicaemia most commonly occurs in the severely compromised host.', 'role': 'assistant'}]