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: Medicine
[{'content': 'A patient present 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 mentronidazole, C. Intravenous steroids and sulphasalazine, D. Hydrocoscone enemas', 'role': 'user'}, {'content': "Answer: B \nExplanation: Answer is B (Intravenous Metronidazole) Presence of the classic .flask shaped ulcers' in a patient presenting with lower gastrointestinal bleeding suggests a diagnosis of 'Intestinal amebic colitits'. 'Patients with amebic colitis should be treated with intravenous or oral Metronidaz,ole.'-", 'role': 'assistant'}]