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': 'Choristoma is \nSelect and explain. \nA. Dilated vascular malformation, B. Malignant stroma of stem cells, C. Normal tissue at abnormal site, D. Benign tumour in which normal elements become abnormally overgrown', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Choristoma Ectopic rest of normal tissue Eg: pancreatic tissue in submucosa of stomach', 'role': 'assistant'}]