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<?php  //<~ don't add me in

add_action( 'genesis_before_entry', 'wpb_remove_comments_category' );

function wpb_remove_comments_category() {
	if ( !in_category( 38 ) ) {//adjust your Category ID's in the conditional
		remove_action( 'genesis_after_entry', 'genesis_get_comments_template' );
	}
}