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:
| District | Incumbent | Party | First elected | Result |
| --- | --- | --- | --- | --- |
| Ohio 1 | Benjamin Eggleston | Republican | 1864 | Lost Re-election Democratic gain |
| Ohio 2 | Samuel F. Cary | Ind-Republican | 1867 (s) | Lost Re-election Republican hold |
| Ohio 3 | Robert C. Schenck | Republican | 1862 | Re-elected |
| Ohio 4 | William Lawrence | Republican | 1864 | Re-elected |
| Ohio 5 | William Mungen | Democratic | 1866 | Re-elected |
| Ohio 6 | Reader W. Clarke | Republican | 1864 | Retired Republican hold |
| Ohio 7 | Samuel Shellabarger | Republican | 1864 | Retired Republican hold |
| Ohio 8 | John Beatty | Republican | 1868 (s) | Re-elected |
| Ohio 9 | Ralph P. Buckland | Republican | 1864 | Retired Democratic gain |
| Ohio 10 | James M. Ashley | Republican | 1862 | Lost Re-election Democratic gain |
| Ohio 11 | John Thomas Wilson | Republican | 1866 | Re-elected |
| Ohio 12 | Philadelph Van Trump | Democratic | 1866 | Re-elected |
| Ohio 13 | Columbus Delano | Republican | 1866 | Retired Democratic gain |
| Ohio 14 | Martin Welker | Republican | 1864 | Re-elected |
| Ohio 15 | Tobias A. Plants | Republican | 1864 | Retired Republican hold |
| Ohio 16 | John Bingham | Republican | 1864 | Re-elected |
| Ohio 17 | Ephraim R. Eckley | Republican | 1862 | Retired Republican hold |
| Ohio 18 | Rufus P. Spalding | Republican | 1862 | Retired Republican hold |
| Ohio 19 | James A. Garfield | Republican | 1862 | Re-elected |
Question:
wWhich district has a retired republican hold with an incumbent of rufus p. spalding?
Answer:
Ohio 18