Need to use where in select box

Field::inst( 'subjects_d.SubjectID' )
            ->options( Options::inst()
                ->table( 'subjects' )
                ->value( 'ID' )
                ->label( 'Name' )
                ->where( 'Type', 1 )
            )
            ->validator( 'Validate::dbValues' ),
        Field::inst( 'subjects.Name' ),

Why where not work in options

->where( 'Type', 1 )