Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Polling Firm | Polling Dates | Bob Chiarelli | Alex Munter | Larry O'Brien | Terry Kilrea (dropped out) |
| --- | --- | --- | --- | --- | --- |
| Decima | 7–9 November 2006 | 11% | 32% | 37% | — |
| UniMarketing | 2–7 November 2006 | 20% | 34% | 25% | — |
| Strategic Counsel | 1–4 November 2006 | 17% | 29% | 27% | — |
| Holinshed | 31 October - 1 November 2006 | 22% | 28% | 24% | — |
| UniMarketing | 13 October 2006 - 18 October 2006 | 23% | 31% | 21% | — |
| Holinshed | 14 October 2006 – 15 October 2006 | 21% | 30% | 26% | — |
| Leger Marketing | 29 September 2006 – 8 October 2006 | 32%^ | 37%^ | 31%^ | — |
| Holinshed | 25 September 2006 – 27 September 2006 | 28.1% | 27.5% | 22.3% | — |
| Decima | 18 September 2006 – 25 September 2006 | 24% | 25% | 20% | — |
| Holinshed | 1 September 2006 * | 22.5% | 24.2% | 18% | — |
| Holinshed | 28 July 2006 * | 20% | 25% | 6.8% | 14% |
| Decima | 23 June 2006 – 26 June 2006 | 20% | 22% | — | 12% |
| Decima | 24 February 2006 – 4 March 2006 | 20% | 27% | — | 14% |
| Decima | 30 April 2005 * | 27%^ | 28%^ | — | 14%^ |
Question:
What dates and firm does Larry O'Brien have 18% when Terry Kilrea dropped out?
Answer:
—