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': 'True about relations of thoracic esophagus ? \nSelect and explain. \nA. Trachea posteriorly, B. Aoic arch on right side, C. Left bronchus anteriorly, D. Thoracic duct on right side', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is'c'i.e., Ieft bronchus anteriorly(Ref: Snell's p. 128)The relations of the thoracic pa of the esophagus from above downward are as follows:Anteriorly: The trachea and the left recurrent laryngeal nerve: the left principal bronchus which constricts it; and the pericardium, which separates the esophagus from the left atrium.Posteriorly : The bodies of the thoracic veebrae, the thoracic duct, the azygos veins, the right posterior intercostal aeries and at its lower end the descending thoracic aoa.Right side: The mediastinal pleura and the terminal pa of the azygos vein.Left side: The left subclan aery, the aoic arch, the thoracic duct the mediastinal pleura.", 'role': 'assistant'}]