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
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: Answer- A. Acute epidydimoorchitisOn elevation of testis the-Pain is not relieved in torsion (test is negative)Pain relieved in epidydimoorchitis (test is positive)