<div class="control-group">
  <label class="control-label">
    <?php echo __('Price Descriptor', 'aviators'); ?>
  </label>
  <div class="controls">
    <?php $mb->the_field('price_descriptor'); ?>
    <select name="<?php $mb->the_name(); ?>" id="<?php $mb->the_name(); ?>">
       <option value="<?php echo get_post_meta($post->ID, '_property_price_descriptor', true) ?>"> <?php echo __('Final Price', 'aviators'); ?> </option>
       <option value="<?php echo get_post_meta($post->ID, '_property_price_descriptor', true) ?>"> <?php echo __('Negotiable Price', 'aviators'); ?> </option>
       <option value="<?php echo get_post_meta($post->ID, '_property_price_descriptor', true) ?>"> <?php echo __('Soom Price', 'aviators'); ?> </option>
    </select>
  </div>
</div>