This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
[{'content': 'Tiger skin appearance of colonic mucosa is seen in \nSelect and explain. \nA. Melanosis coli, B. Ulcerative colitis, C. Environmental enteropathy, D. Carcinoid syndrome', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Melanosis coli is a condition associated with chronic laxative abuse.\nImparts a brown discoloration to colonic mucosa - Tiger skin.', 'role': 'assistant'}]