ExpressionEngine categories loop: Filter by group_id and category_id

In this example, we would like to achieve two things:

1. Only show categories in category_group 2
2. Exclude the category with category_id 68

<div class="form-group"> <label for="title">Categories</label> <br> <select name="category[]" id="categories"> {categories show_group="2"} {if {category_id} != 68} <option value="{category_id}"{selected}> {category_name} </option> {/if} {/categories} </select> </div>