Get only one product category woocommerce

I have to get and show only one category name from a product. I have almost read everything and tried everything.

<?php 
        $term =  get_the_terms( $post->ID, 'product_cat' );
foreach ($term as $t) {
   $parentId = $t->all;
   if($parentId == 0){
     echo $t->name;
   }else{
     $term = get_terms( 'product_cat', array('include' => array($parentId)) );
   }
}

?>

It shows one long string with all the category names. How should I get only one category and show its name. You guys are my last chance. Thank you in advance.