user: Question: Name the sex ratio lowest for population 4773138
Columns: ['Rank', 'District', 'Population', 'Growth rate', 'Sex ratio', 'Literacy', 'Density per Kilometer']
Types: ['real', 'text', 'real', 'text', 'real', 'text', 'real']
Sample row: [27.0, 'Allahabad', 1216719.0, '20.74', 902.0, '74.41', 1087.0]
SQL:

assistant: SELECT MIN("Sex ratio") FROM "Table" WHERE "Population" = 4773138.0;