<prompt> Semen analysis of a male of an infeile couple, shows absence of spermatozoa but presence of fructose. The most probable diagnosis is:Prostatic infectionMumps orchitisBlock in efferent duct systemAll of the above  <response>: 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.DUTTAS TEXTBOOK OF GYNECOLOGY,Pg no:190,7th edition 