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': 'What is false about GIST ? \nSelect and explain. \nA. Associated with NF 1, B. Most common site is stomach, C. Associated with CD 117, D. Least common mesenchymal neoplasm of gastrointestinal tract', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Least common mesenchymal neoplasm of gastrointestinal tract Gastrointestinal stromal tumors (GISTs) GISTs are the most common mesenchymal neoplasm of gastrointestinal tumor. GIST represents a distinct group of gastrointestinal tumors that originate from the interstial cells of cajal which control gastrointestinal peristalsis. GISTs can occur anywhere in the gastroinstestinal tract; the most common site being the stomach followed by small intestine.", 'role': 'assistant'}]