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 3 | John E. Moss | Democratic | 1952.0 | Retired Democratic hold | Bob Matsui (D) 53.4% Sandy Smoley (R) 46.6% |
| California 4 | Robert L. Leggett | Democratic | 1962.0 | Retired Democratic hold | Victor H. Fazio (D) 55.4% Rex Hime (R) 44.6% |
| California 5 | John L. Burton | Democratic | 1974.0 | Re-elected | John L. Burton (D) 66.8% Dolores Skore (R) 33.2% |
| California 8 | Ron Dellums | Democratic | 1970.0 | Re-elected | Ron Dellums (D) 57.4% Charles V. Hughes (R) 42.6% |
| California 10 | Don Edwards | Democratic | 1962.0 | Re-elected | Don Edwards (D) 67.1% Rudy Hansen (R) 32.9% |
| California 15 | Bernice F. Sisk | Democratic | 1954.0 | Retired Democratic hold | Tony Coelho (D) 60.1% Chris Patterakis (R) 39.9% |
| California 16 | Leon Panetta | Democratic | 1976.0 | Re-elected | Leon Panetta (D) 61.4% Eric Seastrand (R) 38.6% |
| California 17 | John Hans Krebs | Democratic | 1974.0 | Lost re-election Republican gain | Chip Pashayan (R) 54.5% John Hans Krebs (D) 45.5% |
| California 20 | Barry Goldwater, Jr. | Republican | 1969.0 | Re-elected | Barry Goldwater, Jr. (R) 66.4% Pat Lear (D) 33.6% |
| California 26 | John H. Rousselot | Republican | 1970.0 | Re-elected | John H. Rousselot (R) Unopposed |
| California 27 | Bob Dornan | Republican | 1976.0 | Re-elected | Bob Dornan (R) 51.0% Carey Peck (D) 49.0% |
| California 30 | George E. Danielson | Democratic | 1970.0 | Re-elected | George E. Danielson (D) 71.4% Henry Ares (R) 28.6% |
| California 31 | Charles H. Wilson | Democratic | 1962.0 | Re-elected | Charles H. Wilson (D) 67.8% Don Grimshaw (R) 32.2% |
| California 35 | James F. Lloyd | Democratic | 1974.0 | Re-elected | James F. Lloyd (D) 54.0% David Dreier (R) 46.0% |
| California 38 | Jerry M. Patterson | Democratic | 1974.0 | Re-elected | Jerry M. Patterson (D) 58.6% Dan Goedeke (R) 41.4% |
| California 40 | Robert Badham | Republican | 1976.0 | Re-elected | Robert Badham (R) 65.9% Jim McGuy (D) 34.1% |
| California 41 | Bob Wilson | Republican | 1952.0 | Re-elected | Bob Wilson (R) 58.1% King Golden, Jr. (D) 41.9% |
Question:
What district is Charles H. Wilson the incumbent of?
Answer:
California 31