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': 'Not true about GIST - \nSelect and explain. \nA. Stomach is the most common site, B. High propensity of malignant change, C. Associated with c-KIT mutation, D. Histology shows spindle shaped cells', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The prognosis depends on tumor size, mitotic index & location.\nRecurrence or metastasis common for mitotic active tumors & more than 10cm but not for others.', 'role': 'assistant'}]