How to remove an option from an exposed filter with a drop-down list?
You use hook_form_alter:

/**
 * Implementation of hook_form_alter().
 */
  function mymodule_form_alter(&amp;$form, &amp;$form_state, $form_id) {
  switch ($form_id) {
  case 'views_exposed_form':
    // Force
    $form['field_gender_value']['#options'] = array('M' =&gt; 'M');
    break;
  }
}