This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Surgery
[{'content': 'Investigation of choice for esophageal rupture is \nSelect and explain. \nA. Dynamic MRI, B. Rigid esophagoscopy, C. Barium contrast swallow, D. Water soluble low molecular weight contrast swallow', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Gastrografin (water soluble) is preferred to prevent extravasation of barium into the mediastinum or pleura. If no leak is seen, a barium study should follow', 'role': 'assistant'}]