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:
Identify the most common word used in the following paragraph.

### Input:
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed quis risus erat. Quisque eget facilisis velit.

### Response:
The most common word used in the paragraph is 'quis', which is used three times.