<prompt> Which is not primary amenorrhea?Sheehans syndromeKallmanns syndromeMayer Rokitansky Koster Hauser syndromeTurner syndrome  <response>: Ans. is a, i.e. Sheehans syndromeRef: Shaw 14thed, p256-257 Kallmanns sydnrome is due to hypothalamic dysfunction characterized by a deficiency of gonadotropin releasing hormone GnRH causing a hypogonadotrophic hypogonadism. This is associated with anosmia. It can occasionally be associated with optic problems, such as color blindness or optic atrophy, nerve deafness, cleft palate, cryptorchidism, renal agenesis, and mirror movement disorder. MRKH syndrome, also known as Mullerian agenesis is due to anatomical absence of uterus. This is the second most common cause of primary amenorrhea. Turners syndrome is a type of gonadal dysgenesis and is overall the most common cause of primary amenorhea Sheehans syndrome is postpartum pituitary necrosis. It leads to secondary amenorrhea and not primary amenorrhea. 