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
[{'content': 'Semen analysis of a male of an infertile couple. shows absence of spermatozoa but presence of fructose. The most probable diagnosis is: \nSelect and explain. \nA. Prostatic infection, B. Mumps orchitis, C. Block in efferect duct system, D. All of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]