<select
        name="{{ field_type.input_name }}"
        {{ html_attributes(field_type.attributes) }}
        {{ field_type.disabled ? 'disabled' }}
        {{ field_type.readonly ? 'readonly' }}>

    {% if field_type.placeholder %}
        <option value disabled>{{ trans(field_type.placeholder) }}</option>
    {% endif %}

    {% for value, option in field_type.options %}
        {% if option is iterable %}
            <optgroup label="{{ trans(value) }}">
                {% for value, option in option %}
                    <option value="{{ value }}" {{ value == field_type.key ? 'selected' }}>{{ trans(option) }}</option>
                {% endfor %}
            </optgroup>
        {% else %}
            <option value="{{ value }}" {{ value == field_type.key ? 'selected' }}>{{ trans(option) }}</option>
        {% endif %}
    {% endfor %}

</select>

<select
        name="{{ field_type.input_name }}"
        {{ html_attributes(field_type.attributes) }}
        {{ field_type.disabled ? 'disabled' }}
        {{ field_type.readonly ? 'readonly' }}>

    {% if field_type.placeholder %}
        <option value {{ field_type.required ? 'disabled' }}>{{ trans(field_type.placeholder) }}</option>
    {% endif %}

    {% for value, option in field_type.options %}
        {% if option is iterable %}
            <optgroup label="{{ trans(value) }}">
                {% for value, option in option %}
                    <option value="{{ value }}" {{ value == field_type.key ? 'selected' }}>{{ trans(option) }}</option>
                {% endfor %}
            </optgroup>
        {% else %}
            <option value="{{ value }}" {{ value == field_type.key ? 'selected' }}>{{ trans(option) }}</option>
        {% endif %}
    {% endfor %}

</select>

Disable the placeholder if required
Disable the placeholder if required
