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 -

• A. Intravenous ceftriaxone
• B. Intravenous metronidazole
• C. Intravenous steroids and sulphasalazine
• D. Hydrocortisone enemas