Question: Which author was also a playwright, Susan Straight or Iris Rainer Dart.

full_context: Document 1: Sara Zarr: Sara Zarr (born October 3, 1970) is an American writer. She was raised in San Francisco, and now lives in Salt Lake City, Utah with her husband. Her first novel, "Story of a Girl", was a 2007 National Book Award finalist. She has subsequently had six novels published.
Document 2: Beatrix Potter: Helen Beatrix Potter (28 July 186622 December 1943) was an English writer, illustrator, natural scientist, and conservationist best known for her children's books featuring animals, such as those in "The Tale of Peter Rabbit".
Document 3: Susan Straight: Susan Straight (born October 19, 1960) is an American writer. She was a National Book Award finalist for the novel "Highwire Moon" in 2001.
Document 4: The Almost Moon: The Almost Moon is the third book and second novel by American writer Alice Sebold, author of her memoir, "Lucky" and "The Lovely Bones." It was released by Little, Brown and Company in the United States on October 16, 2007.
Document 5: Jean Kerr: Jean Kerr (July 10, 1922 – January 5, 2003) was an Irish-American author and playwright born in Scranton, Pennsylvania, and best known for her humorous bestseller, "Please Don't Eat the Daisies", and the plays "King of Hearts" and "Mary, Mary".
Document 6: Beaches (novel): Beaches is a novel written by Iris Rainer Dart about two friends, struggling actress Cee Cee Bloom and the conventional Bertie White (changed to Hilary Whitney in the film). The story follows them through their life as young girls until their mid-to-late 30s.
Document 7: Elizabeth Strout: Elizabeth Strout (born January 6, 1956) is an American novelist and author. She is widely known for her works in literary fiction and her descriptive characterization. Born and raised in Portland, Maine, her experiences in her youth served as inspiration for the themes, motifs, and plot lines in her novels–the fictional "Shirley Falls, Maine" has served as the setting of four of her six novels. After attending Bates College in Lewiston, and Syracuse University in Syracuse, she waitressed before writing her first novel, "Amy and Isabelle" (1998). Her debut was met with widespread critical acclaim, became a national bestseller, and was adapted into a movie starring Elisabeth Shue.
Document 8: Elizabeth Searle: Elizabeth Searle is an American novelist, short story writer and playwright. She has a new novel forthcoming in 2016 and a NYC festival production of her rock opera in 2015. Her works have included the novel "A Four Sided Bed" and the short story collections "My Body to You" and "Celebrities in Disgrace". Her most recent novel "Girl Held in Home" was published in 2011 by New Rivers Press. She wrote the libretto for "Tonya and Nancy:The Opera" which was produced in 2006 and 2010 and 2014. She also wrote the libretto for the full length musical, "Tonya and Nancy: The Rock Opera" which is being produced in NYC as an official Full Production show at the New York Musical Festival (NYMF) in July, 2015. The show premiered in February 2008. A full production was presented in Boston in 2011. A new 'rock concert' production was performed in sold-out club dates in Hollywood in February 2014. Searle's theater works have drawn national media attention.
Document 9: Ira Levin: Ira Marvin Levin (August 27, 1929 – November 12, 2007) was an American novelist, playwright, and songwriter. His most noted works include the novels "A Kiss Before Dying" (1953), "Rosemary's Baby" (1967), "The Stepford Wives" (1972), and "The Boys from Brazil" (1976), as well as the play "Deathtrap" (1978). Many of his novels and plays have been adapted to film.
Document 10: Iris Rainer Dart: Iris Rainer Dart (born March 3, 1944) is an American author and playwright for television and the stage. Her most notable novel is "Beaches", which was made into a 1988 film of the same name. She has also written several stage musicals as well as for television shows, such as "The Sonny and Cher Show". She also voiced Donna, Peter Cottontail's love interest, in the stop-motion Easter classic, Here Comes Peter Cottontail.
Document 11: Beaches (film): Beaches (also known as Forever Friends) is a 1988 American comedy-drama film adapted by Mary Agnes Donoghue from the Iris Rainer Dart novel of the same name. It was directed by Garry Marshall, and stars Bette Midler, Barbara Hershey, Mayim Bialik, John Heard, James Read, Spalding Gray, and Lainie Kazan.
Document 12: A Million Nightingales: A Million Nightingales is a historical novel by writer Susan Straight published in 2006. The novel is about Moinette Antoine, a beautiful and self-educated slave of mixed race living in Louisiana in the early to mid-19th century. Moinette narrates her own story from age 14 when she is taken from her mother to the end of her life when she has become a free woman and business owner. The first-person narration is done in a stream of consciousness style that focuses on Moinette's insightful thoughts and impressions of the strange and brutal world around her.
Document 13: Bernadette Peters: Bernadette Peters (born Bernadette Lazzara; February 28, 1948) is an American actress, singer and children's book author. Over the course of a career that has spanned five decades, she has starred in musical theatre, films and television, as well as performing in solo concerts and recordings. She is one of the most critically acclaimed Broadway performers, having received nominations for seven Tony Awards, winning two (plus an honorary award), and nine Drama Desk Awards, winning three. Four of the Broadway cast albums on which she has starred have won Grammy Awards.
Document 14: Betty Louise Bell: Betty Louise Bell was born on November 23, 1949. She is a scholar and fiction writer of Cherokee ancestry. Bell is a former director of the Native American Studies Program and former assistant professor of American culture, English, and Women's Studies at the University of Michigan. Her areas of scholarly interest include Native American literature, Women's Studies, nineteenth-century American literature, and creative writing. She earned her PhD in 1985 from Ohio State University. Her first novel "Faces in the Moon" was published in 1994 and received favorable reviews. In addition, Bell has published critical articles on Native American Literature that emphasize the political and personal aspects of Native American identity.
Document 15: Alice Sebold: Alice Sebold (born September 6, 1963) is an American writer. She has published three books: "Lucky" (1999), "The Lovely Bones" (2002), and "The Almost Moon" (2007).
ground_truth: Iris Rainer Dart