Where is the Willis Tower located?
The Willis Tower, formerly known as the Sears Tower, is located in the city of Chicago.
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.
### Instruction: Where is the Willis Tower located?
### Input: 
### Response: The Willis Tower, formerly known as the Sears Tower, is located in the city of Chicago.