This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hernia, Subject name: Surgery
Most useful investigation in sliding hernia in female 
Select and explain. 
A. Fluroscopy, B. Barium- meal, C. Palpation method, D. Ultrasound
B: Barium- meal
Answer: B: Barium- meal 
Explanation: (Barium meal) (1281 -B&L 24th) (771-CSDT 12th) (977-Baily & Love 25th)* Finding a segment of colon in the scrotum on barium enema strongly suggests a sliding hernia (771-CSDT 12th)SLIDING -HERNIA (hernia - en-glissade) is a type of indirect inguinal hernia* Almost exclusively in men* It should be suspected in a very large globular inguinal hernia descending well into the scrotum* Right side the caecum is most commonly involved* Left side the sigmoid colon is most commonly involved* The surgical complication most often encountered following sliding hernia repair is bowel injury**