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
True regarding indirect inguinal hernia are all except: 
Select and explain. 
A. Most common type of hernia, B. Always unilateral, C. Inguinal herniotomy is the basic operation, D. Transillumination distinguishes it from hydrocele
B: Always unilateral
Answer: B: Always unilateral 
Explanation: Ans. (b) Always unilateral* In adults- 12 % cases are bilateral hernias* Transillumination is positive in hydrocele and negative in Hernia