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

### Instruction:
What is the Pinyin for the item that has a density of 77?

### Inputs:
table_name: table, columns: ['Name', 'Hanzi', 'Hanyu Pinyin', 'Population (2010-11-01)', 'Area (km²)', 'Density (/km²)']

### Response:
SELECT Hanyu Pinyin FROM table WHERE Density (/km²) = 77