This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Genitourinary radiology, Subject name: Radiology
A 20 year old male came to the emergency depament with the complaint of acute onset of pain in the right scrotum. On examination, the testes were swollen. The transillumination test was negative. Ultrasound of scrotum was performed. what could be the probable diagnosis? 
Select and explain. 
A. Torsion testes, B. Fournier's gangrene, C. Acute epididymorchitis, D. Hydrocele
C: Acute epididymorchitis
Answer: C: Acute epididymorchitis 
Explanation: Acute Epididymo-orchitis Testicular torsion Occurs in young individuals Occurs in young individuals Have acute onset of scrotal pain Have acute onset of scrotal pain On Examination:- Lifting the testis subsides the pain On Examination:- Lifting the testis doesn't have effect and the pain still persist On Color doppler Shows more flow of blood through Testis & Epididymis On Color doppler Absence of flow through Testis & epididymis Normal Acute Epididymo-orchitis Testicular torsion