N.D. Cent. Code § 32-16-07: Requisites of answers

The defendants who have been served personally with the summons and a copy of the complaint, or who have appeared without such service, must set forth in their answer, fully and particularly, the origin, nature, and extent of their respective interests in the property, and if such defendants claim a lien on the property by mortgage, judgment, or otherwise, they must state the original amount and date of the same, and the sum remaining due thereon, whether the same has been secured in any other way or not, and, if secured, the nature and extent of such security, or they are deemed to have waived their right to such lien.