This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urethra and penis, Subject name: Surgery
[{'content': 'Cut off duration for diagnosis of Priaspism is: \nSelect and explain. \nA. 1 hour, B. 2 hours, C. 3 hours, D. 4 hours', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Priapism: It is defined as a persistent painful erection lasting longer than 4 hours irrespective of any sexual stimulation & beyond reaching of orgasm. It is an emergency situation It is of two types: Ischemic priapism Non-ischemic priapism', 'role': 'assistant'}]