Código PHP:
<select class='form-control input-sm' name="moneda" required>
<?php
$sql="select name, symbol from currencies group by symbol order by name ";
$query=mysqli_query($con,$sql);
while($rw=mysqli_fetch_array($query)){
$simbolo=$rw['symbol'];
$moneda=$rw['name'];
if ($rw['moneda']==$simbolo){
$selected="selected";
} else {
$selected="";
}
?>
<option value="<?php echo $simbolo;?>" <?php echo $selected;?>><?php echo ($simbolo);?></option>
<?php
}
?>
</select>
Muchas Gracias de antemano a todos los que se tomen la molestia de leer e intentar ayudar.