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': 'The most common complication seen in a hiatus hernia is \nSelect and explain. \nA. Esophagitis, B. Aspiration pneumonitis, C. Volvulus, D. Esophageal stricture', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]