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:
| Rank | Rowers | Country | Time | Notes |
| --- | --- | --- | --- | --- |
| 1.0 | David Crawshay , Scott Brennan | Australia | 6:21.39 | SA/B |
| 2.0 | Jean-Baptiste Macquet , Adrien Hardy | France | 6:21.92 | SA/B |
| 3.0 | Luka Špik , Iztok Čop | Slovenia | 6:39.49 | SA/B |
| 4.0 | Martin Yanakiev , Ivo Yanakiev | Bulgaria | 6:45.03 | R |
| 5.0 | Su Hui , Zhang Liang | China | excluded | excluded |
Question:
What is the Country of the rowers with a Rank of 4?
Answer:
Bulgaria