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': 'All of the following structures press over the oesophagus, except: \nSelect and explain. \nA. Aoic arch, B. Left atrium, C. Left bronchus, D. Right bronchus', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Right bronchus', 'role': 'assistant'}]