user: Question: What is the building for the R90 pennant?
Columns: ['Name', 'Pennant', 'Builder', 'Laid Down', 'Launched', 'Commissioned']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Chaplet', 'R52', 'Thornycroft , Woolston', '29 April 1943', '18 July 1944', '24 August 1945']
SQL:

assistant: SELECT "Builder" FROM "Table" WHERE "Pennant" = 'R90';