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: Surgery
[{'content': 'Most common oncogene involved in pancreatic adenoma \nSelect and explain. \nA. P53, B. K-RAS, C. APC, D. DCC', 'role': 'user'}, {'content': "Answer: B \nExplanation: 85% of Carcinoma pancreas shows mutant K ras gene on codon 12. 60% show mutation of p53 gene in chromosome 17, over expression of EGFR. Reference : SRB's Manual of Surgery, 6th Edition, page no = 695.", 'role': 'assistant'}]