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': 'Prehn sign is positive in \nSelect and explain. \nA. Acute epidydimoorchitis, B. Chronic orchitis, C. Testicular torsion, D. None', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Answer- A. Acute epidydimoorchitisOn elevation of testis the-Pain is not relieved in torsion (test is negative)Pain relieved in epidydimoorchitis (test is positive)', 'role': 'assistant'}]