This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Testis and scrotum, Subject name: Surgery
[{'content': 'All of the following abnormalities are predisposing causes for torsion of the testis except: \nSelect and explain. \nA. Inversion of testis, B. Low investment of tunica vaginalis, C. Between 10 to 25 years of age, D. Separation of the epidigymis', 'role': 'user'}, {'content': "Answer: B \nExplanation: INTRAVAGINAL TESTICULAR TORSION PREDISPOSING FACTORS Inversion of the testis is MC predisposing factor Bell clapper deformity Separation of the epididymis from the body of testis Blue dot sign : Torsion of Appendage of Testis Prehn's sign is negative (On elevation of testis. Pain relived in epididymoorchitis but not in torsion testis) - Deming sign: Affected testis at higher level because of twisting of cord - Angel sign: Opposite testis lies horizontally because of present of mesorchium IMAGING Color Doppler Tc99 peechnate scan demonstrate poor radionuclide tracer uptake", 'role': 'assistant'}]