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': 'Normal level of PSA is \nSelect and explain. \nA. < 4 ng/ml, B. 4-7 ng/ml, C. 4 - 11ng/ml, D. > 11 ng/ml', 'role': 'user'}, {'content': 'Answer: A \nExplanation: In BPH , prostatitis and cancer is PSA is raised.', 'role': 'assistant'}]