This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Rectum, Subject name: Surgery
Plain abdominal X-ray is useful in: 
Select and explain. 
A. Acute pancreatitis, B. Cholesterol stones, C. Ca cecum, D. Sigmoid volvulus
D: Sigmoid volvulus
Answer: D: Sigmoid volvulus 
Explanation: Ans. (d) Sigmoid Volvulus* Sigmoid Volvulus shows Coffee bean appearance in X-ray* Sigmoid Volvulus Shows Bird beak appearance in Barium enema