This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T., Subject name: Medicine
[{'content': 'Diarrhoea is a feature of all the following except: \nSelect and explain. \nA. Pellagra, B. Diabetes mellitus, C. Antibiotic therapy, D. Steroids', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans: dRef: Harrison, 16thed, p. 405 for a, p. 229 for b p. 228 for c', 'role': 'assistant'}]