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': 'Superior intercostal artery is a branch of- \nSelect and explain. \nA. Costocervical trunk, B. Dorsal scapular artery, C. Thyrocervical trunk, D. Internal thoracic artery', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]