user: Question: What is Lijsttrekker, when Year is after 1990, and when Chair is "Ingrid van Engelshoven"?
Columns: ['Year', 'Lijsttrekker', 'Fractievoorzitter', 'Cabinet', 'Chair']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1966.0, 'no elections', 'none', 'extra-parliamentary', 'Hans van Mierlo']
SQL:

assistant: SELECT "Lijsttrekker" FROM "Table" WHERE "Year" > 1990.0 AND "Chair" = 'Ingrid van Engelshoven';