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 | Thomas Abernethy | Democratic | 1942.0 | Re-elected | Thomas Abernethy (D) Unopposed |
| Mississippi 2 | Jamie L. Whitten | Democratic | 1941.0 | Re-elected | Jamie L. Whitten (D) Unopposed |
| Mississippi 3 | Frank E. Smith | Democratic | 1950.0 | Re-elected | Frank E. Smith (D) Unopposed |
| Mississippi 4 | John Bell Williams | Democratic | 1946.0 | Re-elected | John Bell Williams (D) Unopposed |
| Mississippi 5 | W. Arthur Winstead | Democratic | 1942.0 | Re-elected | W. Arthur Winstead (D) Unopposed |
Question:
In what district is the incumbent John Bell Williams?
Answer:
Mississippi 4