user: Question: Construction start of 1 December 1984 is what unit?
Columns: ['Unit', 'Type', 'Gross MW', 'Construction start', 'Operation start']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Phase I', 'Phase I', 'Phase I', 'Phase I', 'Phase I']
SQL:

assistant: SELECT "Unit" FROM "Table" WHERE "Construction start" = '1 December 1984';