<prompt> Causes of primary amenorrhea are all exceptRokitansky syndromeSheehan syndromeKollman syndromeTurner syndrome  <response>: Ans. is b i.e. Sheehan syndrome Sheehan syndrome causes secondary amenorrhea.While Rokitansky syndrome, Kallman syndrome Turner syndrome all are associated with primary amenorrhea Primary amenorrhea is defined as absence of menses:By 13 years of age when there is no visible secondary sexual characteristic development orBy 15 years of age in the presence of normal secondary sexual characteristics. 