user: Question: What is the poor law union on Marshalstown?
Columns: ['Townland', 's Acre', 'Barony', 'Civil parish', 'Poor law union']
Types: ['text', 'real', 'text', 'text', 'text']
Sample row: ['Abbeyland', 144.0, 'Kilkea and Moone', 'Castledermot', 'Athy']
SQL:

assistant: SELECT "Poor law union" FROM "Table" WHERE "Townland" = 'Marshalstown';