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
Choristoma is 
Select and explain. 
A. 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
C: Normal tissue at abnormal site
Answer: C: Normal tissue at abnormal site 
Explanation: Choristoma Ectopic rest of normal tissue Eg: pancreatic tissue in submucosa of stomach