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': "Which of the following is not a component of mackler's triad for esophageal perforation \nSelect and explain. \nA. Chest pain, B. Vomiting, C. Subcutaneous emphysema, D. Aspirational pneumonitis", 'role': 'user'}, {'content': 'Answer: D \nExplanation: Mackler’s triad consists of chest pain, vomiting and subcutaneous emphysema.', 'role': 'assistant'}]