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 | Title | Directed by | Written by | Original air date | U.S. viewers (in millions) |
| --- | --- | --- | --- | --- | --- |
| 1.0 | " Pilot " | Mark Piznarski | Teleplay by: Josh Schwartz & Stephanie Savage | September19,2007 | 3.50 |
| 2.0 | " The Wild Brunch " | Mark Piznarski | Josh Schwartz & Stephanie Savage | September26,2007 | 2.48 |
| 3.0 | "Poison Ivy" | J. Miller Tobin | Felicia D. Henderson | October3,2007 | 2.75 |
| 4.0 | "Bad News Blair" | Patrick Norris | Joshua Safran | October10,2007 | 2.80 |
| 5.0 | "Dare Devil" | Jamie Babbit | Lenn K. Rosenfeld | October17,2007 | 2.41 |
| 6.0 | "The Handmaiden's Tale" | Norman Buckley | Jessica Queller | October24,2007 | 2.54 |
| 7.0 | "Victor, Victrola" | Tony Wharmby | K.J. Steinberg | November7,2007 | 2.52 |
| 10.0 | " Hi, Society " | Patrick Norris | Joshua Safran | December5,2007 | 2.44 |
| 11.0 | "Roman Holiday" | Michael Fields | Jessica Queller | December19,2007 | 1.81 |
| 12.0 | "School Lies" | Tony Wharmby | Lenn K. Rosenfeld | January2,2008 | 2.19 |
| 13.0 | " The Thin Line Between Chuck and Nate " | Norman Buckley | Felicia D. Henderson | January9,2008 | 2.27 |
| 14.0 | "The Blair Bitch Project" | J. Miller Tobin | K.J. Steinberg | April21,2008 | 2.50 |
| 15.0 | " Desperately Seeking Serena " | Michael Fields | Felicia D. Henderson | April28,2008 | 2.53 |
| 16.0 | " All About My Brother " | Janice Cooke | Paul Sciarrotta | May5,2008 | 2.12 |
| 17.0 | "Woman on the Verge" | Tony Wharmby | Joshua Safran | May12,2008 | 2.71 |
Question:
What is the title when 2.50 is u.s. viewers (in millions)? 
Answer:
"The Blair Bitch Project"