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
Anterior spinal artery is a branch of 
Select and explain. 
A. Internal carotid artery, B. Basilar artery, C. Vertebral artery, D. Labyrinthine artery
C: Vertebral artery
Answer: C: Vertebral artery 
Explanation: None