This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pharyngeal Arches, Subject name: Anatomy
[{'content': '4th Aoic arch is responsible for the formation of - \nSelect and explain. \nA. Arch of aoa, B. Pulmonary aery, C. Pulmonary vein, D. Subclan vein', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 4th arch aery forms aoic arch on left side and proximal pa of subclan aery on right side.', 'role': 'assistant'}]