Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What is the lowest density of serravalle scrivia?

### Inputs:
table_name: table, columns: ['Rank', 'City', 'Population', 'Area (km 2 )', 'Density (inhabitants/km 2 )', 'Altitude (mslm)']

### Response:
SELECT MIN Density (inhabitants/km 2 ) FROM table WHERE City = serravalle scrivia