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: Radiology
In which of the following conditions water soluble contrast media is used 
Select and explain. 
A. Constipation, B. Perforation, C. Ileocecal tuberculosis, D. GERD
B: Perforation
Answer: B: Perforation 
Explanation: (Ref: Grainger and Allison&;s diagnostic radiology 6th edition, chapter 25)