This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urethra & Penis, Subject name: Surgery
[{'content': 'True about prostate specific antigen except: \nSelect and explain. \nA. Normal level is 10-14 ng/mL, B. It my elevated in BPH and Ca Prostate, C. It is produced by prostate, D. It is a glycoprotein', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) Normal level is 10-14ng/mL.Ref: Campbell Urology 11th Edition, Page 2418* Normal serum concentration in men aged 50 to 80 years without prostatic disease range from 1to4ng/ml1.', 'role': 'assistant'}]