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 |
| --- | --- | --- | --- | --- | --- |
| Alabama 1 | Frank W. Boykin | Democratic | 1935.0 | Re-elected | Frank W. Boykin (D) Unopposed |
| Alabama 2 | George M. Grant | Democratic | 1938.0 | Re-elected | George M. Grant (D) Unopposed |
| Alabama 4 | Sam Hobbs | Democratic | 1934.0 | Re-elected | Sam Hobbs (D) 87.9% Thomas G. McNaron (R) 12.1% |
| Alabama 5 | Joe Starnes | Democratic | 1934.0 | Re-elected | Joe Starnes (D) 100.0% George Bogus ( W/I ) 0.003% |
| Alabama 6 | Pete Jarman | Democratic | 1936.0 | Re-elected | Pete Jarman (D) Unopposed |
| Alabama 8 | John Sparkman | Democratic | 1936.0 | Re-elected | John Sparkman (D) Unopposed |
Question:
what are all the district with incumbent being sam hobbs
Answer:
Alabama 4