This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Medicine
[{'content': 'A man presents with mass at duodenojejunal flexurs invading renal papillae. Histopathology repos it as lymphoma; true statement is: \nSelect and explain. \nA. II E stage, B. III E Stage, C. IV E stage, D. Staging cannot be done until bone marrow examination is performed', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Involvement of another organ (kidney) by GI lymphoma of duodenojejunal flexure classifies it as a stage IV lymphomaGI lymphomas are staged using a modified Ann Arbor classification:IE: tumor confined to small intestineIIE: spread to regional lymph nodesIIIE: spread to non-resectable nodes beyond regional nodesIVE: spread to other organs(ref: Meningot 10/e p1181)', 'role': 'assistant'}]