<prompt> A patient presents with lower gastrointestinal bleed. Sigmoidoscopy shows ulcer in the sigmoid. Biopsy from this area shows flask-shaped ulcers. Which of the following is the most appropriate treatment ?Intravenous ceftriaxoneIntravenous metronidazoleIntravenous steroids and sulphasalazineHydrocoisone enemas  <response>: Ans. is b i.e., Intravenous metronidazole Flask-shaped ulcer in a patient of GI bleed suggests amebiasis amoebic dysentry. Drug therapy for amoebiasis Asymptomatic carrier -- Luminal agents Iodoquinol, Paromomycine Diloxanide furoate is the DOC. Acute colitis -- Metronidazole or Tinidazole Luminal agent. Liver abscess Metronidazol or Tinidazole or ornidazole Luminal agent. 