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
True about prostate specific antigen except: 
Select and explain. 
A. 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
A: Normal level is 10-14 ng/mL
Answer: A: Normal level is 10-14 ng/mL 
Explanation: 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.