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 |
| --- | --- | --- | --- | --- | --- |
| California 1 | Clarence F. Lea | Democratic | 1916.0 | Re-elected | Clarence F. Lea (D) Unopposed |
| California 2 | Clair Engle | Democratic | 1943.0 | Re-elected | Clair Engle (D) Unopposed |
| California 3 | J. Leroy Johnson | Republican | 1942.0 | Re-elected | J. Leroy Johnson (R) Unopposed |
| California 5 | Richard J. Welch | Republican | 1926.0 | Re-elected | Richard J. Welch (R) Unopposed |
| California 6 | George Paul Miller | Democratic | 1944.0 | Re-elected | George Paul Miller (D) Unopposed |
| California 8 | Jack Z. Anderson | Republican | 1938.0 | Re-elected | Jack Z. Anderson (R) Unopposed |
| California 10 | Alfred J. Elliott | Democratic | 1937.0 | Re-elected | Alfred J. Elliott (D) Unopposed |
| California 13 | Ned R. Healy | Democratic | 1944.0 | Lost re-election Republican gain | Norris Poulson (R) 51.8% Ned R. Healy (D) 48.2% |
| California 15 | Gordon L. McDonough | Republican | 1944.0 | Re-elected | Gordon L. McDonough (R) Unopposed |
| California 17 | Cecil R. King | Democratic | 1942.0 | Re-elected | Cecil R. King (D) Unopposed |
| California 18 | Clyde Doyle | Democratic | 1944.0 | Lost re-election Republican gain | Willis W. Bradley (R) 52.8% Clyde Doyle (D) 47.2% |
Question:
who is the the incumbent with candidates being jack z. anderson (r) unopposed
Answer:
Jack Z. Anderson