Which is correct?<br/><br/>Our speciality is children's tales.<br/><br/>or<br/><br/>Our speciality are children's tales.<br/><br/>According to the key - it is the first sentence and I don't know why <img class='emoticon' style='Width:19px;Height:19px;' data-delaysrc='https://uat-englishforward-forums-backend.s3.us-west-2.amazonaws.com/Emoticons/6.gif' src='https://uat-englishforward-forums-backend.s3.us-west-2.amazonaws.com/Emoticons/6.gif' alt='Emotion: sad'/>