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': 'An infant with severe respiratory distress is found to have double aoic arch during investigation. Double aoic arch is due to persistence and continued patency of the segment of ? \nSelect and explain. \nA. Right dorsal aoa between the right seventh intersegmental aery and its junction with the left dorsal aoa, B. Right dorsal aoa between the right sixth intersegmental aery and its junction with the left dorsal aoa, C. Left dorsal aoa between the right seventh intersegmental aery and its junction with the left dorsal aoa, D. Left dorsal aoa between the right sixth intersegmental aery and its junction with the left dorsal aoa', 'role': 'user'}, {'content': "Answer: A \nExplanation: Aoic arch development involves the sequential development and then involution of six arch pairs, which arise from paired dorsal aoae that fuse distally. The fifth aoic arch is rudimentary. Double aoic arch is the result of persistence and continued patency of the segment of the right dorsal aoa between the origin of the right seventh intersegmental aery and its junction with the left dorsal aoa. Ref: Keller B.B., Markwald R.R., Hoying J.B. (2011). Chapter 9. Molecular Development of the Hea. In V. Fuster, R.A. Walsh, R.A. Harrington (Eds), Hurst's The Hea, 13e.", 'role': 'assistant'}]