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
Prehn sign is positive in - 
Select and explain. 
A. Acute epidydimoorchitis, B. Chronic orchitis, C. Testicular torsion, D. None
A: Acute epidydimoorchitis
Answer: A: Acute epidydimoorchitis 
Explanation: 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)