user: Question: What was reserved in the district that has 169 constituents?
Columns: ['Constituency number', 'Name', 'Reserved for ( SC / ST /None)', 'District', 'Number of electorates (2003)']
Types: ['text', 'text', 'text', 'text', 'real']
Sample row: ['166', 'Shujalpur', 'None', 'Shajapur', 177272.0]
SQL:

assistant: SELECT "Reserved for ( SC / ST /None)" FROM "Table" WHERE "Constituency number" = '169';