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: Anatomy
[{'content': 'In case of IVC obstruction the collateral which opens up are all except: \nSelect and explain. \nA. Superior epigastric & inferior epigastric vein, B. Azygos & ascending lumbar vein, C. Superficial epigastric & ileolumbar vein, D. Lateral thoracic veins & preveebral vein', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e., Superficial epigastric & iliolumbar vein', 'role': 'assistant'}]