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:
| Rd. | Circuit | City / State | Date | Format | Round winner | Car | Entrant |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 1.0 | Symmons Plains | Launceston , Tasmania | 5 March | One race | Peter Brock | Holden LX Torana A9X | Marlboro Holden Dealer Team |
| 2.0 | Oran Park | Sydney , New South Wales | 26 March | One race | Peter Brock | Holden LX Torana A9X | Marlboro Holden Dealer Team |
| 3.0 | Amaroo Park | Sydney , New South Wales | 9 April | One race | Allan Grice | Holden LX Torana A9X | Craven Mild Racing |
| 4.0 | Sandown | Melbourne , Victoria | 16 April | One race | Ian Geoghegan | Holden LX Torana A9X | Bob Jane T-Marts |
| 5.0 | Wanneroo Park | Perth , Western Australia | 7 May | Two heats | Peter Brock | Holden LX Torana A9X | Marlboro Holden Dealer Team |
| 6.0 | Calder | Melbourne , Victoria | 28 May | One race | Bob Morris | Holden LX Torana A9X | Ron Hodgson Channel 7 Racing Team |
| 7.0 | Lakeside | Brisbane , Queensland | 25 June | One race | Allan Moffat | Ford XC Falcon | Moffat Ford Dealers |
Question:
Which circuit has two heats as the format?
Answer:
Wanneroo Park