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: Pathology
[{'content': 'Old male with H/O long intake of antibiotics. Diagnosis? \nSelect and explain. \nA. Pseudomembranous Colitis, B. Chrons, C. Ulcerative colitis, D. Amoebic colitis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) Pseudomembranous enterocolitisThe mucosal surface of the colon seen here is hyperemic and is partially covered by a yellow-green exudate.', 'role': 'assistant'}]