This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pancreas, Subject name: Surgery
[{'content': 'Most common primary leading to secondaries in pancreas;- \nSelect and explain. \nA. Lung, B. Breast, C. Colon, D. Stomach', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Metastatic tumors to pancreas MC site of primary: RCC > malignant melanoma On autopsy, MC site of primary: Ca lung', 'role': 'assistant'}]