Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Date | Cover model | Centerfold model | Interview subject | 20 Questions | Pictorials |
| --- | --- | --- | --- | --- | --- |
| 1-97 | Marilyn Monroe | Jami Ferrell | Whoopi Goldberg | Mike Judge | Marilyn Monroe |
| 3-97 | Faye Resnick | Jennifer Miriam | Clint Eastwood | Michael Jordan | Faye Resnick, Sharry Konopski |
| 4-97 | Joey Heatherton | Kelly Monaco | Vincent Bugliosi | Vanessa L. Williams | Female s dentist , Dolly Martin |
| 6-97 | Victoria Silvstedt | Carrie Stevens | Dennis Rodman | Julianna Margulies | Carmen Electra , Victoria Silvstedt - PMOY |
| 7-97 | Farrah Fawcett (two alternative covers) | Daphnée Duplaix | Anthony Edwards | Jon Lovitz | Farrah Fawcett, Brandi Brandt |
| 8-97 | Nikki Ziering | Kalin Olson | Bill Maher | Norm Macdonald | Biker Babes |
| 10-97 | Stacy Fuson | Layla Roberts | Tommy Hilfiger | Téa Leoni | Girls of the Big Ten |
| 11-97 | Suzen Johnson | Inga Drozdova | Brett Favre | Robert Wuhl | Suzen Johnson |
Question:
When was Kalin Olson listed as  the centerfold model?
Answer:
8-97