A defendant is not confined to denials of the allegations of the complaint or petition, but is entitled to set out new matter in defense or as a basis for affirmative relief. Any complaint or petition for relief in a court must be filed within the statutory time limit (Statute of Limitations). These statutes vary from state to state.
This form is a generic example of an answer and affirmative defense that may be referred to when preparing such a pleading for your particular state.