This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
Superior pa of IVC develops from which pa? 
Select and explain. 
A. Right vitelline vein, B. Subcardinal vein, C. Anterior cardinal vein, D. Sacrocardinal vein
A: Right vitelline vein
Answer: A: Right vitelline vein 
Explanation: Anterior cardinal vein and subcardinal vein will be degenerated during development where as sacrocardinal segment forms the inferior pa. Reference: TEXTBOOK OF CLINICAL EMBRYOLOGY.... VISHRAM SINGH SECOND EDITION....PAGE NO:245