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
[{'content': 'Which is the 1st sign of strangulation of ingunial hernia - \nSelect and explain. \nA. Tense, B. Tender, C. Irreducible, D. Redness', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e. Tender", 'role': 'assistant'}]