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:
| No. in series | No. in season | Title | Directed by | Written by | Original air date | U.S. viewers (millions) |
| --- | --- | --- | --- | --- | --- | --- |
| 32.0 | 1.0 | "A Death in the Family" | Mark Tinker | Shonda Rhimes , Jon Cowan & Robert Rovner | October1,2009 | 11.58 |
| 33.0 | 2.0 | "The Way We Were" | Donna Deitch | Patti Carr & Lara Olsen | October8,2009 | 9.50 |
| 34.0 | 3.0 | "Right Here, Right Now" | Rob Corn | Dana Baratta | October15,2009 | 10.36 |
| 35.0 | 4.0 | "Pushing the Limits" | Allison Liddi-Brown | Ayanna A. Floyd | October22,2009 | 9.93 |
| 36.0 | 5.0 | "Strange Bedfellows" | Steve Gomer | Kathy McCormick | October29,2009 | 9.16 |
| 37.0 | 6.0 | "Slip Slidin’ Away" | Helen Shaver | Fred Einesman | November5,2009 | 9.11 |
| 38.0 | 7.0 | "The Hard Part" | Mark Tinker | Steve Blackman | November12,2009 | 10.25 |
| 39.0 | 8.0 | "Sins of the Father" | Tom Verica | Elizabeth J.B. Klaviter | November19,2009 | 8.93 |
| 40.0 | 9.0 | "The Parent Trap" | Donna Deitch | Craig Turk | December3,2009 | 9.21 |
| 41.0 | 10.0 | "Blowups" | Mark Tinker | Sonay Washington | December3,2009 | 9.21 |
| 42.0 | 11.0 | "Another Second Chance" | Michael Zinberg | Krista Vernoff & Kathy McCormick | January14,2010 | 10.96 |
| 43.0 | 12.0 | "Best Laid Plans" | Bethany Rooney | Patti Carr & Lara Olsen | January21,2010 | 9.64 |
| 44.0 | 13.0 | "Shotgun" | Karen Gaviola | Jon Cowan & Robert Rovner | February4,2010 | 9.25 |
| 45.0 | 14.0 | "Love Bites" | Matthew Penn | Dana Baratta | February11,2010 | 9.04 |
| 46.0 | 15.0 | "Til Death Do Us Part" | Kenny Leon | Craig Turk | February18,2010 | 7.59 |
| 47.0 | 16.0 | "Fear of Flying" | Mark Tinker | Ayanna A. Floyd | March4,2010 | 7.57 |
| 48.0 | 17.0 | "Triangles" | Tom Verica | Steve Blackman | March11,2010 | 7.66 |
| 49.0 | 18.0 | "Pulling the Plug" | Ann Kindberg | Kathy McCormick | March25,2010 | 8.71 |
| 50.0 | 19.0 | "Eyes Wide Open" | Eric Stoltz | Jesse Zigelstein | April1,2010 | 7.82 |
| 51.0 | 20.0 | "Second Choices" | Jeff Bleckner | Patti Carr & Lara Olsen | April22,2010 | 7.49 |
| 52.0 | 21.0 | "War" | Eric Stoltz | Elizabeth Klaviter & Sonay Washington | April29,2010 | 7.78 |
| 53.0 | 22.0 | "In the Name of Love" | Mark Tinker | Fred Einesman | May6,2010 | 8.15 |
Question:
What was the airdate of episode number 18?
Answer:
March25,2010