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': 'Rectus abdominis free ﬂap is supplied by: \nSelect and explain. \nA. Intercostals artery, B. Iliolumbar artery, C. Epigastric artery, D. Thoraco-lumbar artery', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The rectus abdominis muscle flap is supplied by 2 vascular pedicles, the cranial and caudal epigastric vessels .\nThe 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.', 'role': 'assistant'}]