imperforate hymen
... that an imperforate hymen is the most common congenital cause of vaginal obstruction?
... that an <b id="mwBtQ"><a href="./Imperforate_hymen" id="mwBtU" rel="mw:WikiLink" title="Imperforate hymen">imperforate hymen</a></b> is the most common <a class="mw-redirect" href="./Congenital" id="mwBtY" rel="mw:WikiLink" title="Congenital">congenital</a> cause of <a class="mw-redirect" href="./Vaginal_obstruction" id="mwBtc" rel="mw:WikiLink" title="Vaginal obstruction">vaginal obstruction</a>?