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: Unknown
Which of the following contrast is used for esophageal perforation? 
Select and explain. 
A. Barium swallow, B. Gadolinium, C. Lohexol, D. Gastrograffin
C: Lohexol
Answer: C: Lohexol 
Explanation: Ref. Grainger and Allison's Diagnostic Radiology. Page. 13
 
Non ionic water soluble contrast should be used in most cases of esophageal perforation such as Iohexol .
Water soluble contrast should be used instead of barium contrast to prevent barium related inflammation of the mediastinum if there is perforation .