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': 'In priapism, cavernous blood study will reveal: \nSelect and explain. \nA. pO2 < 30%, pCO2>60%, B. pCO2>60%, C. pCO2<60%, D. pO2<60%', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Blood Gas Values in Priapism Source pO2 (mmHg) pCO2 (mmHg) pH Normal aerial blood (room air) >90 <40 7.40 Normal mixed venous blood (room air) 40 50 7.35 Ischemic Priapism (First corporal aspirate) <30 >60 <7.25 Ref: Campbell 11th edition Pgno: 678', 'role': 'assistant'}]