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: Pathology
[{'content': 'The most common site of GIST is - \nSelect and explain. \nA. Ileum, B. Esophagus, C. Colon, D. Stomach', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Gastrointestinal stromal tumors (GISTs) \n\nGISTs are the most common mesenchymal neoplasm of gastrointestinal tumor.\nGIST represents a distinct group of gastrointestinal tumors that originate from the interstitial cells of cajal which control gastrointestinal peristalsis.\nGISTs can occur anywhere in the gastroinstestinal tract; the most common site being the stomach followed by the small intestine.\n\nStomach\xa0→ 50-70%\nSmall intestine\xa0→\xa020-30%\nColon & rectum → 5-15%\nEsophagus\xa0→ <5%', 'role': 'assistant'}]