Question: Meryl Poster executive produced a romantic comedy-drama film based on a novel by who?

Context paragraphs:
Alfie (2004 film): Alfie is a 2004 British-American romantic comedy-drama film based on the 1966 British film of the same name, starring Jude Law as the title character, originally played by Michael Caine.  The film was written, directed, and produced by Charles Shyer.

Meryl Poster: Meryl Poster is the president and founder of Superb Entertainment.  Until October 2014, she was president of television at The Weinstein Company.  Poster was previously the Co-President of Production for Miramax Films, where she executive produced the Academy Award Winning Chicago (2002) and Academy Award Nominated Cider House Rules (1999) and Chocolat (2000).  She is an executive producer of the Bravo drama The Girlfriend’s Guide to Divorce, which premiered in December 2014.

Mansfield Park (film): Mansfield Park is a 1999 British romantic comedy-drama film based on Jane Austen's novel of the same name, written and directed by Patricia Rozema.  The film departs from the original novel in several respects.  For example, the life of Jane Austen is incorporated into the film, as well as the issues of slavery and plantation life.  The majority of the film was made at Kirby Hall in Northamptonshire.

Gayby: Gayby is a 2012 American romantic comedy-drama film based on the 2010 short film of the same name.  It debuted on March 12, 2012 at the South by Southwest film festival.

She's Dating the Gangster: She's Dating the Gangster is a 2014 Filipino teen romantic comedy-drama film based on the best Pop Fiction book of the same name originally published on CandyMag.com's "Teen Talk" section and it was popularized on Wattpad by Bianca Bernardino (pen name: SGwannaB).  The film is directed by Cathy Garcia-Molina, starring Kathryn Bernardo and Daniel Padilla.  It was distributed by Star Cinema with co-production of Summit Media and was released on July 16, 2014 in theatres nationwide as part of its 20th anniversary presentation.

Prime (film): Prime is a 2005 American romantic comedy-drama film starring Uma Thurman, Meryl Streep and Bryan Greenberg.  It was written and directed by Ben Younger.  The film grossed $67,937,503 worldwide.

Chocolat (2000 film): Chocolat (] ) is a 2000 British-American romantic comedy-drama film based on the novel "Chocolat" by Joanne Harris, and was directed by Lasse Hallström.  Adapted by screenwriter Robert Nelson Jacobs, "Chocolat" tells the story of a young mother, played by Juliette Binoche, who arrives at the fictional, repressed French village of Lansquenet-sous-Tannes with her six-year-old daughter and opens "La Chocolaterie Maya", a small chocolaterie.  Her chocolate quickly begins to change the lives of the townspeople.

Even Cowgirls Get the Blues (film): Even Cowgirls Get the Blues is a 1993 American romantic comedy-drama film based on Tom Robbins' 1976 novel of the same name.  The film was directed by Gus Van Sant (credited as Gus Van Sant, Jr.) and starred an ensemble cast led by Uma Thurman, Lorraine Bracco, Angie Dickinson, Noriyuki "Pat" Morita, Keanu Reeves, John Hurt, and Rain Phoenix.  Robbins himself was the narrator.  The soundtrack was sung entirely by k.d. lang.  The film was dedicated to the late River Phoenix.

Noah's Arc: Jumping the Broom: Noah's Arc: Jumping the Broom is a 2008 American romantic comedy-drama film based on the LOGO television series "Noah's Arc".  It was released on October 24, 2008 in select theaters and video on demand.  The film is MPAA rated R in the U.S. for "sexual content and language."

List of accolades received by Forrest Gump: "Forrest Gump" is a 1994 epic romantic comedy-drama film based on the 1986 novel of the same name by Winston Groom.  The film premiered in Los Angeles, California on June 23, 1994 and was released into the United States and Canada on July 6, 1994, opening into 1,595 domestic theaters and earning $24,450,602 on its first weekend.  "Forrest Gump" grossed $677 million and was at its time the fourth highest grossing film of all time (behind only "E.T. the Extra-Terrestrial", "Star Wars IV: A New Hope", and "Jurassic Park").  Despite its praise, it has only a 72% approval rating on Rotten Tomatoes.

Supporting paragraphs: Meryl Poster Chocolat (2000 film)
Answer: Joanne Harris