Balık sisters
...that the Balık sisters from Turkey claim to be the only identical twins who are both professional opera singers?
...that the <b id="mwBUk"><a class="mw-redirect" href="./Balık_sisters" id="mwBUo" rel="mw:WikiLink" title="Balık sisters">Balık sisters</a></b> from <a href="./Turkey" id="mwBUs" rel="mw:WikiLink" title="Turkey">Turkey</a> claim to be the only <a class="mw-redirect" href="./Identical_twin" id="mwBUw" rel="mw:WikiLink" title="Identical twin">identical twins</a> who are both professional <a href="./Opera" id="mwBU0" rel="mw:WikiLink" title="Opera">opera</a> singers?