<?php
$field = get_field_object('field_XXXXXXXX'); // field key of your field
if (!empty($field['choices'])) {
?>
<select name="your-field-name">
<?php
foreach ($field['choices'] as $v => $l) {
?><option value="<?php echo $v; ?>><?php echo $l; ?></option?<?php
}
?>
</select>
<?php
}