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 & prevertebral vein
C: Superficial epigastric & ileolumbar vein
Answer: C: Superficial epigastric & ileolumbar vein 
Explanation: Whenever there is an obstruction in superior or inferior vena cava, collateral circulation opens up to connect inferior vena cava and superior vena cava. This helps in circulation being maintained by draining into the right atrium. The veins that can form collaterals include
-        Superior epigastric
-        Internal thoracic
-        Lateral thoracic
-        thoracoepigastric
-        Posterior intercostal
-        Lumbovertebral
-        Superficial epigastric
-        Superficial circumflex iliac
-        Deep circumflex iliac
-        Inferior epigastric
-        External pudendal
-        Azygous
-        Hemizygous
-        Ascending lumbar