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
In case of IVC obstruction the collateral which opens up are all except: 
Select and explain. 
A. Superior epigastric & inferior epigastric vein, B. Azygos & ascending lumbar vein, C. Superficial epigastric & ileolumbar vein, D. Lateral thoracic veins & preveebral vein
C: Superficial epigastric & ileolumbar vein
Answer: C: Superficial epigastric & ileolumbar vein 
Explanation: C i.e., Superficial epigastric & iliolumbar vein