This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T., Subject name: Pathology
Most common organ involved in GIST is? 
Select and explain. 
A. Ileum, B. Duodenum, C. Colon, D. Stomach
D: Stomach
Answer: D: Stomach 
Explanation: Ans. is 'd' i.e., Stomach * GISTs are the most common mesenchymal neoplasm of gastrointestinal tract. GIST represents a distinct group of gastrointestinal tumors that originate from the interstial cells ofcajal which control gastrointestinal peristalsis.* GISTs can occur anywhere in the gastroinstestinal tract; the most common site being the stomach followed by small intestine.