Question: Sarah Drew had which role on the ABC drama Grey's Anatomy?

full_context: Document 1: Sarah Dunn (author): Sarah Dunn (born 1970) is an American author and television writer. She is known for her novels 'The Big Love' and 'Secrets to Happiness', and the ABC sitcom "American Housewife", starring Katy Mixon.
Document 2: Sadie Harris: Sadie Harris was a recurring fictional character from the American television medical drama "Grey's Anatomy", which airs on the American Broadcasting Company (ABC) in the United States. The character was created by series producer Shonda Rhimes and portrayed by actress Melissa George. Introduced as a surgical intern who has an old companionship with the series' protagonist Meredith Grey (Ellen Pompeo), she eventually forms a friendship with Lexie Grey (Chyler Leigh), and departs after it is revealed she cheated her way into the surgical program.
Document 3: Jennifer Morrison: Jennifer Marie Morrison (born April 12, 1979) is an American actress, producer, director, and former child model. She is known for her roles as Dr. Allison Cameron in the medical-drama series "House" (2004–2012) and Emma Swan in the ABC adventure-fantasy series "Once Upon a Time" (2011–2017). She also has portrayed Zoey Pierson, one of Ted Mosby's love interests on the comedy series "How I Met Your Mother"; Winona Kirk, mother of James T. Kirk in the 2009 science-fiction film "Star Trek"; and Tess Conlon in the 2011 sports drama film "Warrior".
Document 4: Lexie Grey: Alexandra Caroline "Lexie" Grey, M.D. is a fictional character from the medical drama television series "Grey's Anatomy", which airs on ABC in the United States. The character was created by series' producer Shonda Rhimes and was portrayed by actress Chyler Leigh from the third through eighth seasons. She was introduced as a surgical intern in season three. Serving as Meredith Grey (Ellen Pompeo)'s half sister, she transferred to the fictional Seattle Grace Hospital, after her mother's sudden death. Eventually named a surgical resident, the character was originally contracted to appear for a multi-episode story arc, but received star billing in the fourth season.
Document 5: Chyler Leigh: Chyler Leigh West (pronounced ; "née" Potts; born April 10, 1982), known professionally as Chyler Leigh, is an American actress, singer and model, best known for her portrayals of Janey Briggs in "Not Another Teen Movie" and Dr. Alexandra "Lexie" Grey in the ABC medical drama "Grey's Anatomy". In October 2015, she began starring, in a lead role, in the CBS/CW show "Supergirl" as Alexandra "Alex" Danvers.
Document 6: Sarah Chalke: Sarah Chalke ( ; born August 27, 1976) is a Canadian actress. She is known for portraying Dr. Elliot Reid on the NBC/ABC comedy series "Scrubs", the second Rebecca "Becky" Conner on the ABC sitcom "Roseanne", Stella Zinman on the CBS sitcom "How I Met Your Mother", and Beth Smith on Adult Swim's adult animated science-fiction series "Rick and Morty". She also had a recurring role on the third season of the ABC/TBS sitcom "Cougar Town".
Document 7: Sarah Drew: Sarah Drew (born October 1, 1980) is an American actress. She is known for playing Hannah Rogers in The WB family drama series "Everwood" (2004–2006) and Dr. April Kepner in the ABC medical drama series "Grey's Anatomy" (2009–present).
Document 8: Sarah Hyland: Sarah Jane Hyland (born November 24, 1990) is an American actress. Born in New York City, Hyland attended the Professional Performing Arts School in Manhattan, followed by small roles in the films "Private Parts" (1997), "Annie" (1999), and "Blind Date" (2007). She gained her first major role as Haley Dunphy on the ABC sitcom "Modern Family", for which she has received critical acclaim and numerous accolades and nominations, sharing four Screen Actors Guild Award for Outstanding Performance by an Ensemble in a Comedy Series with her cast members and garnering a Critics' Choice Television Award nomination Best Supporting Actress in a Comedy Series.
Document 9: April Ludgate: April Roberta Ludgate-Dwyer (portrayed by Aubrey Plaza) is a fictional character in the NBC comedy "Parks and Recreation". She is first seen as an apathetic college student working as an intern in the Pawnee Department of Parks and Recreation, before being hired as Ron Swanson's assistant. She later becomes the Deputy Director of Animal Control. April, along with Plaza's performance, garnered universal acclaim and has gained popularity for her goth-like behavior and deadpan-style comedy.
Document 10: Jackson Avery: Jackson Avery, M.D. is a fictional character from ABC prime time medical drama, "Grey's Anatomy", portrayed by actor Jesse Williams. The character was created by series creator and executive producer, Shonda Rhimes. He was introduced in season six, episode 5, "Invasion" as a former surgical resident from "Mercy West Medical Center" when it merges with "Seattle Grace Hospital". Williams initially appeared as a recurring cast member, and was later promoted to a series regular in season seven. The character's focal storyline involved his attempt to fit in at his new work environment, and trying to finding his own successes, instead of riding on the coattails of his famous family name. The character has also had significant romances with Lexie Grey and Stephanie Edwards. He was married but is now divorced to April Kepner. The couple had a child, Samuel Avery, who died soon after birth. However, the pair have a daughter, Harriett, who was not named after Catherine much to her dismay. She was conceived prior to the divorce. Dr. Avery later becomes a member of the board of directors at the newly established, "Grey Sloan Memorial Hospital", and is the current chairman.
Document 11: Rachel Green: Rachel Karen Green is a fictional character, one of the six main characters who appeared in the American sitcom "Friends". Portrayed by actress Jennifer Aniston, the character was created by show creators David Crane and Marta Kauffman, and appeared in each of the show’s 236 episodes during its decade-long run, from its premiere on September 22, 1994 to its finale on May 6, 2004. Introduced in the show's pilot as a naive runaway bride who reunites with her childhood best friend Monica and relocates to New York City, Rachel gradually evolves from a spoiled, inexperienced daddy's girl into a successful businesswoman. During the show's second season, the character becomes romantically involved with her friend Ross, with whom she maintains a complicated on-again, off-again relationship throughout the entire series. Together, the characters have a daughter, Emma.
Document 12: April Kepner: April Kepner M.D., is a fictional character from the television medical drama "Grey's Anatomy" which airs on the American Broadcasting Company (ABC) in the United States. The character was created by series producer Shonda Rhimes and is portrayed by actress Sarah Drew. She was introduced in the episode "Invasion" as a former surgical resident at Mercy West Hospital who joins the staff at Seattle Grace Mercy West after the two hospitals merge to compensate for the absence of some of the central cast members, and was created to be disliked by her colleagues. The character was originally set to appear in two episodes, Drew's contract was extended to the remainder of the sixth season, with her becoming a series regular in the seventh season. The character's focal storyline involved her struggle with fitting into the new work environment, her religious beliefs and balancing her duties as the hospital's chief resident and her friendship with her colleagues and as of the end of season eight, her relationship with her best friend and now ex-husband Jackson Avery.
Document 13: Kate Walsh (actress): Kathleen Erin Walsh (born October 13, 1967) is an American actress and businesswoman. Her roles include Dr. Addison Montgomery on the ABC television dramas "Grey's Anatomy" and "Private Practice", Rebecca Wright on the short-lived NBC sitcom "Bad Judge", and Olivia Baker on the Netflix drama series "13 Reasons Why".
Document 14: Grey's Anatomy (season 3): The third season of the American television medical drama Grey's Anatomy, commenced airing on the American Broadcasting Company (ABC) on September 21, 2006, and concluded on May 17, 2007. The season was produced by Touchstone Television, in association with Shondaland Production Company and The Mark Gordon Company, the showrunner being Shonda Rhimes. Actors Ellen Pompeo, Sandra Oh, Katherine Heigl, Justin Chambers, and T.R. Knight reprised their roles as surgical interns Meredith Grey, Cristina Yang, Izzie Stevens, Alex Karev, and George O'Malley, respectively, continuing their expansive storylines as focal points throughout the season. Previous main cast members Chandra Wilson, James Pickens, Jr., Kate Walsh, Isaiah Washington, and Patrick Dempsey also returned, while previous guest stars Sara Ramirez and Eric Dane were promoted to series regulars, following the extension of their contracts.
Document 15: Stephanie Edwards (Grey's Anatomy): Stephanie Edwards, M.D. is a fictional character from the medical drama television series "Grey's Anatomy", which airs on the American Broadcasting Company (ABC) in the United States. The character was created by series producer Shonda Rhimes, and was portrayed by actress Jerrika Hinton from 2012 to 2017. Introduced as a surgical intern at the fictional Seattle Grace Mercy West Hospital, later renamed Grey Sloan Memorial Hospital, Stephanie works her way up to resident level with fellow intern and friend, Jo Wilson (Camilla Luddington).
ground_truth: April Kepner M.D.