This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thorax, Subject name: Anatomy
[{'content': 'Superior intercostal aery is a branch of \nSelect and explain. \nA. Costocervical trunk, B. Dorsal scapular aery, C. Thyrocervical trunk, D. Internal thoracic aery', 'role': 'user'}, {'content': "Answer: A \nExplanation: Superior intercostal arery is a branch of costocervical trunk of subclan aery. BD chaurasia's human anatomy.6th edition volume 1.page no 219.", 'role': 'assistant'}]