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

### Instruction:
What districts of Bihar have a sex ratio in 1991 of 864?

### Inputs:
table_name: table, columns: ['Districts of Bihar', 'Total Population 2001', 'Male Population 2001', 'Female Population 2001', 'Growth Rate 1981-91', 'Growth Rate 1991-01', 'Sex Ratio ‡ 1991', 'Sex Ratio ‡ 2001', 'Population density † 1991', 'Population density † 2001']

### Response:
SELECT Districts of Bihar FROM table WHERE Sex Ratio ‡ 1991 = 864