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
About Gastrointestinal Stromal Tumor (GIST) all are true except - 
Select and explain. 
A. 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
D: ALK mutation is seen in most cases
Answer: D: ALK mutation is seen in most cases 
Explanation: . ALK mutation is seen in most cases