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:
| Result | Date | Race | Venue | Group | Distance | Weight (kg) | Jockey | Winner/2nd |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 2nd | 02 Aug 1996 | 3yo Hcp Restricted | Rosehill | NA | 1500 m | 55 | J. Marshall | 1st - Spy Cracker |
| 12th | 11 Jan 1997 | 3yo Hcp Restricted | Rosehill | NA | 1350 m | 51 | J. Morris | 1st - Purist |
| 2nd | 26 Jan 1997 | 3yo Hcp Restricted | Randwick | NA | 1800 m | 54.5 | J. Cassidy | 1st - Sir Markie |
| Won | 09 Feb 1997 | 3yo & Up Hcp Restricted | Canterbury | NA | 1900 m | 55.5 | J. Cassidy | 2nd - Myban Star |
| Won | 16 Feb 1997 | 3yo & Up Hcp Restricted | Canterbury | NA | 1900 m | 54 | J. Cassidy | 2nd - Nimzo Indian |
| 2nd | 01 Mar 1997 | Canterbury Guineas | Rosehill | G1 | 1800 m | 55.5 | J. Cassidy | 1st - Intergaze |
| 7th | 15 Mar 1997 | Rosehill Guineas | Rosehill | G1 | 2000 m | 55.5 | J. Cassidy | 1st - Tarnpir Lane |
| 4th | 29 Mar 1997 | Australian Derby | Randwick | G1 | 2400 m | 55.5 | B. York | 1st - Ebony Grosve |
Question:
What was the weight in kg when the jockey was B. York? 
Answer:
55.5