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
Rectus abdominis free ﬂap is supplied by: 
Select and explain. 
A. Intercostals artery, B. Iliolumbar artery, C. Epigastric artery, D. Thoraco-lumbar artery
C: Epigastric artery
Answer: C: Epigastric artery 
Explanation: The rectus abdominis muscle flap is supplied by 2 vascular pedicles, the cranial and caudal epigastric vessels .
The principal blood supply is the caudal epigastric artery, which perfuses approximately 2/3 of the length of the muscle, with the remainder of the muscle supplied by the cranial epigastric artery.