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 | Location | Gold | Silver | Bronze |
| --- | --- | --- | --- | --- |
| 2005.0 | Herne Hill | Kate Cullen Ian Smith | Jo Tindley Colin Denman | Joy Nixon Derek Marloe |
| 2006.0 | Reading | Victoria Pendleton Sean Bannister | Laura Bissell Ian Smith | Leda Cox Paul Spender |
| 2007.0 | Maindy | Victoria Pendleton Sean Bannister | Alex Greenfield Unknown | Katie Curtis Unknown |
| 2008.0 | Maindy | Janet Birkmyre Graham Bristow | Hannah Rich James Taylor | Joanne McRae Colin Denman |
| 2009.0 | Newport | Danni King Courtney Rowe | Emma Patterson George Gilbert | Melanie Sneddon Doug Pinkerton |
| 2010.0 | Scunthorpe | Laura Trott Sean Bannister | Danni King Courtney Rowe | Janet Birkmyre Graham Bristow |
| 2011.0 | Herne Hill | Hannah Walker Peter Bäuerlein | Claire Newland Dave Scott | Corrine Hall Derek Marloe |
| 2012.0 | Herne Hill | Hannah Walker George Gilbert | Corrine Hall Derek Marloe | Joanne McRae Sean Bannister |
Question:
Who won the Silver the Year Katie Curtis Unknown won the Bronze?
Answer:
Alex Greenfield Unknown