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': '40 year old men is suffering from fever & pain in scrotum which is not relieved by elevation of testis. 3 days before had sexual contact with a young female ? \nSelect and explain. \nA. Testicular tumour, B. Acute epididymitis, C. Torsion of testis, D. Acute orchitis', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans is 'c' ie Torsion of testis Torsion of testis can be differentiated from acute epididymitis by Prehn's sign. ie. On elevation of testis the pain increases in --> Torsion On elevation of testis the pain decreases in epididymoorchitis. Dont be confused with fever, it can also occur in torsion, especially in older patients.", 'role': 'assistant'}]