This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urology, Subject name: Surgery
[{'content': 'Torsion testis diagnosed is confirmed by? \nSelect and explain. \nA. B mode USG, B. Color doppler, C. CT scan, D. MRI', 'role': 'user'}, {'content': "Answer: B \nExplanation: Diagnosis of torsion testis is confirmed by Doppler ultrasound scan(colour doppler). By this, the absence of blood supply (testicular aery ) to the affected testis is confirmed. But performing this test may squander vital minutes. If there is any doubt about the diagnosis, scrotum should be explored without any delay Reference : page 1380 Bailey and Love's sho practice of surgery 25th edition", 'role': 'assistant'}]