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: Gynaecology & Obstetrics
Semen analysis of a male of an infertile 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 efferect duct system, D. All of the above
C: Block in efferect duct system
Answer: C: Block in efferect duct system 
Explanation: None