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: Radiology
[{'content': 'The given x-ray is suggestive of \nSelect and explain. \nA. TGA, B. TAPVC, C. Coarctation of aorta, D. Patent ductus arteriosus', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Figure of 3 sign or double bulge sign - COA.', 'role': 'assistant'}]