user: Question: What is the head of government for Don Stephen Senanayake?
Columns: ['Name', 'Party', 'Tenure', 'Head(s) of Government', 'Ministerial title']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Don Stephen Senanayake', 'United National Party', '24 September 1947 - 22 March 1952', 'Don Stephen Senanayake', 'Minister of External Affairs and Defence']
SQL:

assistant: SELECT "Head(s) of Government" FROM "Table" WHERE "Name" = 'Don Stephen Senanayake';