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

### Instruction:
How tall is the Anqing Bridge which opened prior to 2011?

### Inputs:
table_name: table, columns: ['Name', 'Height of bridge structure', 'Longest Span', 'Type', 'Opened', 'Location']

### Response:
SELECT Height of bridge structure FROM table WHERE Opened < 2011 AND Name = anqing bridge