This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Oesophagus, Subject name: Surgery
[{'content': 'Dysphagia lusoria is by: \nSelect and explain. \nA. Neural anomaly, B. Malabsrption, C. Vascular anomaly, D. Any', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. (c) Vascular anomalyRef Internet source* Aberrant right subclavian artery arising from descending aortic arch is associated with dysphagia.* There is posterior esophageal compression', 'role': 'assistant'}]