Question: Which district had SC reserved and 169 Constituents?
SQL: SELECT "District" FROM "2-18517401-1" WHERE "Reserved for ( SC / ST /None)" = 'SC' AND "Constituency number" = '169';

Question: What was reserved in the district that has 169 constituents?
SQL: SELECT "Reserved for ( SC / ST /None)" FROM "2-18517401-1" WHERE "Constituency number" = '169';