This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Infertility, Subject name: Gynaecology & Obstetrics
Semen analysis of a male of an infeile couple, shows absence of spermatozoa but presence of fructose. The most probable diagnosis is: 
Select and explain. 
A. Prostatic infection, B. Mumps orchitis, C. Block in efferent duct system, D. All of the above
C: Block in efferent duct system
Answer: C: Block in efferent duct system 
Explanation: The efferent ducts may be obstructed by infection like tubercular,gonococcal or by surgical trauma following vasectomy. The absence of fructose suggests congenital absence of seminal vesicle or poion of ductal system or both.Its clinical significance is less. D.C.DUTTA'S TEXTBOOK OF GYNECOLOGY,Pg no:190,7th edition