This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Testis & Scrotum, 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: Ans. is 'a' i.e., Acute epidydimoorchitis Prehn's sign on elevation of testis the:* pain is not relieved in torsion (test is negative)* pain relieved in epidydimoorchitis (test is positive)", 'role': 'assistant'}]