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
[{'content': 'A 55-year-old diabetic patient presented with impotence with a history of failure to get an erection after papaverine intracavernous injection. Colour Doppler shows no. abnormality of arteries but shows mild venous run-off, Treatment of choice here would be \nSelect and explain. \nA. Intracavernous injection of papaverine, B. Penile prosthetic implants, C. Vacuum constriction device, D. Psychotherapy', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Vacuum Constriction devices\n\nit consists of a plastic cylinder connected to a vacuum generating source. After the penis is engorged by the negative pressure, a constricting ring is applied to the base to maintain the erection. To avoid injury the ring should not be left in place for longer than 30 min.\nSuch devices are suitable for those who fail to achieve an adequate erection with Intracavernous injection therapy and those with venous disorders of the penis.\nThese devices are more acceptable in older men in a steady relationship than to young single men in search of a partner.', 'role': 'assistant'}]