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: Surgery
[{'content': 'What is epicolic node ? \nSelect and explain. \nA. Node draining colon, B. Adjacent to aorta, C. Epitracheal node, D. None', 'role': 'user'}, {'content': 'Answer: A \nExplanation: • Lymphatic drainage also follows the arterial anatomy.\n• Lymphatics from the colon and proximal two thirds of the rectum ultimately drain into the para-aortic nodal chain, which empties into the cisterna chyli.\n• Superior and inferior mesenteric nodes are part of Pre-aortic group of lymph nodes.\n• Lymphatics draining the distal rectum and anal canal may drain either to the para-aortic nodes or laterally, through the internal iliac system, to the superficial inguinal nodal basin (dentate line roughly marks the level where lymphatic drainage diverges).\n• Lymph nodes are commonly grouped into levels depending on their location.', 'role': 'assistant'}]