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 | Oscar Lee Gray | Democratic | 1914.0 | Retired Democratic hold | John McDuffie (D) Unopposed |
| Alabama 2 | S. Hubert Dent, Jr. | Democratic | 1908.0 | Re-elected | S. Hubert Dent, Jr. (D) Unopposed |
| Alabama 3 | Henry B. Steagall | Democratic | 1914.0 | Re-elected | Henry B. Steagall (D) Unopposed |
| Alabama 5 | J. Thomas Heflin | Democratic | 1904.0 | Re-elected | J. Thomas Heflin (D) Unopposed |
| Alabama 6 | William B. Oliver | Democratic | 1914.0 | Re-elected | William B. Oliver (D) Unopposed |
| Alabama 8 | Edward B. Almon | Democratic | 1914.0 | Re-elected | Edward B. Almon (D) Unopposed |
Question:
Who was the incumbent when ran william b. oliver (d) unopposed?
Answer:
William B. Oliver