This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
Which is the 1st sign of strangulation of ingunial hernia - 
Select and explain. 
A. Tense, B. Tender, C. Irreducible, D. Redness
B: Tender
Answer: B: Tender 
Explanation: Ans. is 'b' i.e. Tender