<form>

<div class="answer1wrap">

<select id="mySelect">

<option value="void">Choose your answer</option>

<option value="To measure time">To measure time</option>

<option value="To measure distance">To measure distance</option>

<option value="To measure volume">To measure volume</option>

</select>

</div>

</form>

<button class="btn btn-default" id="checkbtn" onclick="answers();" type="button"><span    class="glyphicon glyphicon-check"></span> Check answers</button>