Interrogatories may relate to any matters which can be inquired into under § 15-6-26(b), and the answers may be used to the extent permitted by the rules of evidence.
An interrogatory otherwise proper is not necessarily objectionable merely because an answer to the interrogatory involves an opinion or contention that relates to fact or the application of law to fact, but the court may order that such interrogatory need not be answered until after designated discovery has been completed or until a pretrial conference or other later time.
SDCL 15-6-33(b)