How to remove class nav from yii\bootstrap\Nav?

Question

Yii

In the menu I specify the option
'options' => ['class' => 'main-nav'],
on the output I get class="main-nav nav" how to remove the extra nav ?
why add it at all?
I need a menu like this

<li><a class="ico ico-catalog" href="#">Каталог</a></li>
                    <li><a class="ico ico-works" href="#">Работы</a></li>

Answer 1

The issue was resolved

'template' => '<a href="{url}" class="ico ico-about">{label}</a>',

Answer 2

You are using yii\bootstrap\Nav, bootstrap!
Of course there will be nav, it's an essential part of bootstrap navigation. Use native widgets if you need something of your own.