<prompt> 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 :Intravenous ceftriaxoneIntravenous mentronidazoleIntravenous steroids and sulphasalazineHydrocoscone enemas  <response>: 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.- 