(735 ILCS 5/6-117) (from Ch. 110, par. 6-117)
    Sec. 6-117. General denial. Under a general denial which alleges generally that the defendant is not guilty of unlawfully withholding the premises claimed by the plaintiff, the defendant may offer in evidence any matter that may tend to defeat the plaintiff's action, except that it shall not put in issue the possession of the premises by the defendant or that he or she claims title or interest in the premises.
(Source: P.A. 82-280.)