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': 'About Gastrointestinal Stromal Tumor (GIST) all are true except - \nSelect and explain. \nA. Most common site is stomach, B. Originates from interstitial cells of Cajal, C. Size plays a role in prognosis, D. ALK mutation is seen in most cases', 'role': 'user'}, {'content': 'Answer: D \nExplanation: . ALK mutation is seen in most cases', 'role': 'assistant'}]