This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anatomy (Prostate & Seminal Vesicales), Subject name: Surgery
Normal level of PSA in male is? 
Select and explain. 
A. < 4 ng/ml, B. 4-10 ng/ml, C. >10 ng/ml, D. PSA is not produced by normal males
A: < 4 ng/ml
Answer: A: < 4 ng/ml 
Explanation: ANSWER: (A) < 4 ng/mlREF: Bailey and love 24th ed p. 1383PSA Levels<4ng/mlNormal4-10 ng/mlBPH and carcinoma both>10 ng/mlApprox. 75% will have cancer