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

### Instruction:
Who conducted the poll with sample size of 2000 that shows 18% undecided?

### Inputs:
table_name: table, columns: ['Date of opinion poll', 'Conductor', 'Sample size', 'For', 'Against', 'Undecided']

### Response:
SELECT Conductor FROM table WHERE Undecided = 18% AND Sample size = 2000