Okla. Stat. tit. 12 § 3233
Each interrogatory shall be answered separately and fully in writing under oath, unless it is objected to, in which event the objecting party shall state the reasons for objection and shall answer to the extent the interrogatory is not objectionable. When answering each interrogatory, the party shall restate the interrogatory, then provide the answer. The number of interrogatories to a party shall not exceed thirty in number. Interrogatories inquiring as to the names and locations of witnesses, or the existence, location and custodian of documents or physical evidence shall be construed as one interrogatory. All other interrogatories, including subdivisions of one numbered interrogatory, shall be construed as separate interrogatories. No further interrogatories will be served unless authorized by the court. If counsel for a party believes that more than thirty interrogatories are necessary, counsel shall consult with opposing counsel promptly and attempt to reach a written stipulation as to a reasonable number of additional interrogatories. Counsel are expected to comply with this requirement in good faith. In the event a written stipulation cannot be agreed upon, the party seeking to submit such additional interrogatories shall file a motion with the court (1) showing that counsel have conferred in good faith but sincere attempts to resolve the issue have been unavailing, (2) showing reasons establishing good cause for their use, and (3) setting forth the proposed additional interrogatories. The answers are to be signed by the person making them, and the objections signed by the attorney making them. Interrogatories may, without leave of court, be served upon any party after the filing of a petition. The party upon whom the interrogatories have been served shall serve a copy of the answers, and objections if any, within thirty (30) days after the service of the interrogatories. The 30-day response period shall not commence until an answer to the petition is filed. However, upon leave of court or otherwise agreed to in writing by the parties subject to Section 3229 of this title, answers to interrogatories may be required prior to the filing of an answer to the petition. All grounds for an objection to an interrogatory shall be stated with specificity. Any ground not stated in a timely objection is waived unless the party's failure to object is excused by the court for good cause shown. The party submitting the interrogatories may move for an order under subsection A of Section 3237 of this title with respect to any objection to or other failure to answer an interrogatory.
An interrogatory otherwise proper is not necessarily objectionable because an answer to the interrogatory involves an opinion or contention that relates to fact or the application of law to fact. The court may order that such an interrogatory need not be answered until after designated discovery has been completed or until a pretrial conference or other later time.
Okla. Stat. tit. 12, § 3233