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

Context paragraphs:
Ranitomeya amazonica: Ranitomeya amazonica is a poison dart frog in the genus "Ranitomeya".  It was first described by Rainer Schulte in 1999 as "Dendrobates amazonicus" when he separated it from "Dendrobates ventrimaculatus", primarily on the basis of call characteristics.  The validity of the species has been debated, but further studies, also including genetic data, support its validity.

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.

The People in the Picture: The People in the Picture is a musical with book and lyrics by Iris Rainer Dart and music by Mike Stoller and Artie Butler.  The musical is about a grandmother recalling her life in the Yiddish theater and the Holocaust.

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.

The Believer (magazine): The Believer is a bi-monthly magazine of interviews, essays, and reviews.  Founded by the writers Heidi Julavits, Vendela Vida, and Ed Park in 2003, the magazine is a five-time finalist for the National Magazine Award, with contributors ranging from literary luminaries such as Hilton Als, Anne Carson, Nick Hornby, Susan Straight, and William T. Vollmann to emerging talents for whom the magazine has been a proving ground, including Eula Biss, Gideon Lewis-Kraus, Leslie Jamison, Rachel Kaadzi Ghansah, Kent Russell, and Rivka Galchen.

Iris acutiloba subsp. lineolata: Iris acutiloba" subsp.  "lineolata is a species in the genus "Iris", it is also in the subgenus of Iris.  It is a subspecies of "Iris acutiloba", and is a rhizomatous perennial, from the mountains of Iran, Turkey, Turkmenistan, Tajikistan and Azerbaijan.  It has narrow, lanceolate, or falcate (sickle-shaped) leaves, which are grey-green and glaucous.  It has a slender straight stem holding one terminal flower.  The flowers, come in shades of white, cream, or creamy white and have veining that is purple or brown, or a mixture of both.  It is heavily veined or streaked in purple or brown, with a dark purple-brown, spot on 3 of the outer petals and brown, dark purple, or black short beard.  It is rarely cultivated as an ornamental plant in temperate regions, unless grown in a greenhouse.

Ethel Anson Peckham: Ethel Anson (Steel) Peckham (1879–1965) was an American horticulturist and botanical artist who bred plants that grow from bulbs and rhizomes such as iris and daffodil.  She was a founding member and early director of the American Iris Society (AIS), editor of its first major checklists, and author of its iris-judging rules.  She bred iris herself and is credited with helping to introduce a new class, the miniature tall bearded iris.  She is one of only a dozen people to have received the AIS Gold Medal, the society's highest honor, and she was also awarded the Gold Medal of the British Iris Society for her paintings of iris.

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.

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.

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.

Supporting paragraphs: Susan Straight Iris Rainer Dart
Answer: Iris Rainer Dart