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

### Instruction:
When zhang'an county 章安縣 is the commandery capital what is the province?

### Inputs:
table_name: table, columns: ['Province', 'Provincial capital', 'Commandery', 'Commandery capital', 'No. of counties']

### Response:
SELECT Province FROM table WHERE Commandery capital = Zhang'an County 章安縣