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:
| Name | Pennant number | Builder | Laid Down | Launched | Commissioned | Current status |
| --- | --- | --- | --- | --- | --- | --- |
| Minerva | F 551 | Fincantieri , Riva Trigoso | 11 March 1985 | 3 April 1986 | 10 June 1987 | Retired |
| Urania | F 552 | Fincantieri, Riva Trigoso | 4 April 1985 | 21 June 1986 | 1 June 1987 | Active |
| Danaide | F 553 | Fincantieri, Muggiano | 26 June 1985 | 18 October 1986 | 9 September 1987 | Active |
| Sfinge | F 554 | Fincantieri, Muggiano | 2 September 1986 | 16 May 1987 | 13 February 1988 | Active |
| Driade | F 555 | Fincantieri, Riva Trigoso | 18 March 1988 | 11 March 1989 | 19 April 1990 | Active |
| Chimera | F 556 | Fincantieri, Riva Trigoso | 21 December 1988 | 7 April 1990 | 15 January 1991 | Active |
| Fenice | F 557 | Fincantieri, Riva Trigoso | 6 September 1988 | 9 September 1989 | 11 September 1990 | Active |
| Sibilla | F 558 | Fincantieri, Muggiano | 16 October 1989 | 15 September 1990 | 16 May 1991 | Retired on October 1st, 2012 |
Question:
what builder is now retired
Answer:
F 551