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: Surgery
[{'content': 'A patient presents with lower gastrointestinal bleed. Sigmoidoscopy shows ulcers in the sigmoid. Biopsy from this area shows flask-shaped ulcers. Which of the following is the most appropriate treatment - \nSelect and explain. \nA. Intravenous ceftriaxone, B. Intravenous metronidazole, C. Intravenous steroids and sulphasalazine, D. Hydrocortisone enemas', 'role': 'user'}, {'content': 'Answer: B \nExplanation: • MC site of amebic colitis: Cecum and ascending colon.\n• Flask shaped ulcers on colonoscopy confirms the diagnosis of amebic colitis.\n• Asymptomatic carrier: Luminal agents (Iodoquinol, paromomycin).\n• Acute colitis: Metronidazole and luminal agents.\n• Amebic liver abscess: Metronidazole, tinidazole and luminal agents.', 'role': 'assistant'}]