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:
| Riding | Candidate's Name | Gender | Residence | Occupation | Votes | Rank |
| --- | --- | --- | --- | --- | --- | --- |
| Central Nova | Michael Mackay | M | West River Station | Retail | 427.0 | 4th |
| Dartmouth—Cole Harbour | George Campbell | M | Dartmouth | Minister | 219.0 | 5th |
| Halifax West | Trevor Ennis | M | Halifax | Swimming Pool Salesman | 257.0 | 5th |
| Kings—Hants | Jim Hnatiuk | M | Enfield | Combat Systems Technician | 528.0 | 5th |
| South Shore—St. Margaret's | Joe Larkin | M | Shag Harbour | Retired | 513.0 | 5th |
Question:
What is the Riding, when the Rank is 4th?
Answer:
Central Nova