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 |
| --- | --- | --- | --- | --- | --- |
| Mississippi 1 | John E. Rankin | Democratic | 1920.0 | Re-elected | John E. Rankin (D) Unopposed |
| Mississippi 2 | Bill G. Lowrey | Democratic | 1920.0 | Re-elected | Bill G. Lowrey (D) Unopposed |
| Mississippi 3 | William Madison Whittington | Democratic | 1924.0 | Re-elected | William Madison Whittington (D) Unopposed |
| Mississippi 4 | Jeff Busby | Democratic | 1922.0 | Re-elected | Jeff Busby (D) Unopposed |
| Mississippi 5 | Ross A. Collins | Democratic | 1920.0 | Re-elected | Ross A. Collins (D) Unopposed |
| Mississippi 6 | T. Webber Wilson | Democratic | 1922.0 | Re-elected | T. Webber Wilson (D) Unopposed |
| Mississippi 7 | Percy E. Quin | Democratic | 1912.0 | Re-elected | Percy E. Quin (D) Unopposed |
Question:
who is  the incumbent for district mississippi 4
Answer:
Jeff Busby