This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.N.S, Subject name: Medicine
[{'content': 'Persistent priapism is rarely seen as a consequence IS \nSelect and explain. \nA. Sickle cell disease, B. Leukemia, C. Spinal cord disease, D. Prolonged sexual activity', 'role': 'user'}, {'content': "Answer: C \nExplanation: Harrison's principles of internal medicine 17th edition. * Priapism refers to a persistent and painful erection and may be associated with hypercoagulable states,spinal cord injury or injection of vasodilator agents in to the penis", 'role': 'assistant'}]