This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
[{'content': 'Overgrowth of a skin structure at a localised region - \nSelect and explain. \nA. Hamaoma, B. Malignant tumor, C. Choriostoma, D. Polyp', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Hamaoma is a mass of disorganized tissue indigenous to the paicular site. A polyp is a mass that projects above a mucosal surface, as in the gut, to form a macroscopically visible structure. Choristoma is a congenital anomaly consisting of a heterotopic rest of cells. For example, a small nodule of well-developed and normally organized pancreatic tissue may be found in the submucosa of the stomach, duodenum, or small intestine. (Robbins Basic Pathology, 9 th edition. page : 162,163)', 'role': 'assistant'}]