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: Surgery
[{'content': 'Dysphagia lusoria is due to - \nSelect and explain. \nA. Oesophageal diverticulum, B. Aneurysm of aorta, C. Oesophageal web, D. Compression by aberrant blood vessel.', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Dysphagia Lusoria is a disorder of swallowing caused due to vascular anomalies\n\nCauses of Dysphagia Lusoria \n\nA right aortic arch\nA double aortic arch\nA vascular constricting ring formed by a PDA or a ligamentum arteriosum and the pulmonary artery or aortic arch.\nAn abnormal right subclavian artery. (Arteria lusoria)\nAn abnormal innominate artery.\nDiagnosis is made by a lipoidal swallow or by arteriography.', 'role': 'assistant'}]