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:
| Year | Date | Circuit | Winning driver | Winning constructor | Report |
| --- | --- | --- | --- | --- | --- |
| 1965 | 4 December | Kyalami | Jack Brabham | Brabham - Climax | Report |
| 1964 | 12 December | Kyalami | Graham Hill | Brabham - BRM | Report |
| 1963 | 14 December | Kyalami | John Surtees | Ferrari | Report |
| 1962 | 15 December | Kyalami | Jim Clark | Lotus - Climax | Report |
| 1961 | 9 December | Kyalami | Jim Clark | Lotus - Climax | Report |
| 1956 | 24 March | Palmietfontein | Peter Whitehead | Ferrari | Report |
| 1937 (II) | 16 December | Lord Howe Circuit | Douglas van Riet | Austin | Report |
| 1937 (I) | 30 January | Lord Howe Circuit | Pat Fairfield | ERA | Report |
Question:
Which circuit did Peter Whitehead win?
Answer:
Palmietfontein