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
Superior intercostal artery is a branch of- 
Select and explain. 
A. Costocervical trunk, B. Dorsal scapular artery, C. Thyrocervical trunk, D. Internal thoracic artery
A: Costocervical trunk
Answer: A: Costocervical trunk 
Explanation: None