This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Abdominal Radiography, Subject name: Radiology
Investigation that is done for intestinal obstruction is? 
Select and explain. 
A. Chest X Ray, B. X ray abdomen supine, C. X ray abdomen lateral, D. Barium meal
B: X ray abdomen supine
Answer: B: X ray abdomen supine 
Explanation: ANSWER' (B) X ray abdomen supineREF: Sabiston 17th edition page 1357, Bailey & love 24th edition page 1189Investigations for intestinal obstruction:X ray: (according to bailey: supine abdominal films are preferred. According to sabiston erect and supine views are preferred)Barium studies: done for large bowel obstruction and contraindicated in acute obstructionCT scan: helpful in identifying location and cause of obstruction.