user: Question: What is the rank of london borough in Southwark?
Columns: ['Rank', 'London Borough', 'Black African Population', 'Black Caribbean Population', 'Other Black Population', 'Total Black Population']
Types: ['real', 'text', 'real', 'real', 'real', 'real']
Sample row: [1.0, 'Lambeth', 35187.0, 28886.0, 14469.0, 78542.0]
SQL:

assistant: SELECT "Rank" FROM "Table" WHERE "London Borough" = 'Southwark';