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 | Candidates |
| --- | --- | --- | --- | --- | --- |
| Texas 1 | Jim Chapman | Democratic | 1985.0 | Re-elected | Jim Chapman (D) 62.2% Horace McQueen (R) 37.8% |
| Texas 3 | Steve Bartlett | Republican | 1982.0 | Re-elected | Steve Bartlett (R) 81.8% Blake Cowden (D) 18.2% |
| Texas 8 | Jack Fields | Republican | 1980.0 | Re-elected | Jack Fields (R) Unopposed |
| Texas 9 | Jack Brooks | Democratic | 1952.0 | Re-elected | Jack Brooks (D) Unopposed |
| Texas 10 | J. J. Pickle | Democratic | 1963.0 | Re-elected | J. J. Pickle (D) 93.4% Vincent J. May ( L ) 6.6% |
| Texas 12 | Jim Wright | Democratic | 1954.0 | Re-elected | Jim Wright (D) Unopposed |
| Texas 13 | Beau Boulter | Republican | 1984.0 | Retired to run for U. S. Senate Democratic gain | Bill Sarpalius (D) 52.5% Larry S. Milner (R) 47.5% |
| Texas 16 | Ronald D. Coleman | Democratic | 1982.0 | Re-elected | Ronald D. Coleman (D) Unopposed |
| Texas 17 | Charles Stenholm | Democratic | 1978.0 | Re-elected | Charles Stenholm (D) Unopposed |
| Texas 19 | Larry Combest | Republican | 1984.0 | Re-elected | Larry Combest (R) 67.7% Gerald McCathern (D) 32.3% |
| Texas 21 | Lamar S. Smith | Republican | 1986.0 | Re-elected | Lamar S. Smith (R) 93.2% Jim Robinson ( L ) 6.8% |
| Texas 24 | Martin Frost | Democratic | 1978.0 | Re-elected | Martin Frost (D) 92.6% Leo Sadovy (R) 7.4% |
| Texas 26 | Dick Armey | Republican | 1984.0 | Re-elected | Dick Armey (R) 69.3% Jo Ann Reyes (D) 30.7% |
Question:
Who were the candidates when Jack Fields was the incumbent?
Answer:
Jack Fields (R) Unopposed