Question: Who is both a poet and a novelist, Tim O'Brien or Lavinia Greenlaw?

full_context: Document 1: Lavinia Greenlaw: Lavinia Greenlaw (born 30 July 1962) is an English poet and novelist. Her most recent work is "A Double Sorrow: A Version of Troilus and Criseyde", which was shortlisted for the Costa Poetry Award in 2014.
Document 2: Henry Petowe: Henry Petowe (1575/6–1636?) was a minor Elizabethan poet, best known today, perhaps, for "The Second Part of "Hero and Leander", Containing their Further Fortunes," his sequel to Christopher Marlowe's "Hero and Leander".
Document 3: Ron Kovic: Ronald Lawrence "Ron" Kovic (born July 4, 1946) is an American anti-war activist, writer, and former United States Marine Corps sergeant, who was wounded and paralyzed in the Vietnam War. He is best known as the author of his 1976 memoir "Born on the Fourth of July", which was made into the Academy Award–winning eponymous film in 1989 directed by Oliver Stone.
Document 4: The Rape of Lucrece: The Rape of Lucrece (1594) is a narrative poem by William Shakespeare about the legendary Lucretia. In his previous narrative poem, "Venus and Adonis" (1593), Shakespeare had included a dedicatory letter to his patron, the Earl of Southampton, in which he promised to write a "graver work". Accordingly, "The Rape of Lucrece" has a serious tone throughout.
Document 5: Billy Lynn's Long Halftime Walk: Billy Lynn's Long Halftime Walk is a satirical war novel written by Ben Fountain, which was published in early May 2012 by Ecco Press, a publishing imprint of HarperCollins. The novel chronicles the experience of a group of Iraq War veterans who are hailed as heroes and sent on a victory tour following their engagement in an intense firefight that happened to be caught on camera. Set during a single day, the story primarily focuses on Specialist Billy Lynn's perspective as he struggles to reconnect with his family and come to grips with the huge disconnect between the realities of the war at home and the war overseas as Bravo Squad is sent to participate in the Dallas Cowboys' Thanksgiving halftime show. The novel's primary themes include fraternity, the commercialization of war, and what it really means to support the war when the real costs are barely felt by the majority of US citizens at home.
Document 6: The Short-Timers: The Short-Timers is a 1979 semi-autobiographical novel by U.S. Marine Corps veteran Gustav Hasford, about his experience in the Vietnam War. It was later adapted into the film "Full Metal Jacket" (1987) by Hasford, Michael Herr, and Stanley Kubrick. Hasford's novel "The Phantom Blooper" (1990) is a sequel to "The Short-Timers". The book was supposed to be the first of a trilogy, but Hasford died soon after completing its sequel and before writing the third installment.
Document 7: Larry Heinemann: Larry Heinemann (born 1944) is an American novelist born and raised in Chicago. His published work—three novels and a memoir—is primarily concerned with the Vietnam War.
Document 8: Slaughterhouse-Five: Slaughterhouse-Five, or The Children's Crusade: A Duty-Dance with Death (1969) is a satirical novel by Kurt Vonnegut about the World War II experiences and journeys through time of Billy Pilgrim, from his time as an American soldier and chaplain's assistant, to postwar and early years. It is generally recognized as Vonnegut's most influential and popular work. A central event is Pilgrim's surviving the Allies' firebombing of Dresden as a prisoner-of-war. This was an event in Vonnegut's own life, and the novel is considered semi-autobiographical.
Document 9: The Yellow Birds: The Yellow Birds is the debut novel from American writer, poet, and Iraq war veteran Kevin Powers. It was one of "The New York Times"'s 100 Most Notable Books of 2012 and a finalist for the 2012 National Book Award. It was awarded the 2012 The Guardian First Book Award, and the 2013 Hemingway Foundation/PEN Award.
Document 10: Chaitivel: "Chaitivel", also known as "Les Quatre Deuils" or "Le Malheureux" in modern French or "The Four Sorrows" in English, is a Breton lai by the medieval poet Marie de France. "Chaitivel" is the tenth poem in the collection known as the "Lais of Marie de France" and is one of very few lais to contain alternate titles. Like the other poems in this collection, "Chaitivel" is written in the Anglo-Norman dialect of Old French, in couplets of eight syllables in length.
Document 11: Lavinia Cohn-Sherbok: Lavinia Cohn-Sherbok (born Surrey, England) is a novelist, the author of numerous books about Judaism and
Document 12: Tim O'Brien (author): William Timothy "Tim" O'Brien (born October 1, 1946) is an American novelist. He best known for his "The Things They Carried" (1990), a collection of linked short stories. These semi-autobiographical stories were inspired by O'Brien's experiences in the Vietnam War. In 2010 the "New York Times" described O'Brien's book as a Vietnam classic. In addition, he is known for his war novel, "Going After Cacciato" (1978), also about wartime Vietnam, and later novels about postwar lives of veterans.
Document 13: Sonnet 154: As the last in the famed collection of sonnets written by English poet and playwright William Shakespeare from 1592 to 1598, Sonnet 154 is most often thought of in a pair with the previous sonnet, number 153. As A. L. Rowse states in "Shakespeare's Sonnets: The Problems Solved", Sonnets 153 and 154 "are not unsuitably placed as a kind of coda to the Dark Lady Sonnets, to which they relate." Rowse calls attention to the fact that Sonnets 153 and 154 "serve quite well to round off the affair Shakespeare had with Emilia, the woman characterized as the Dark Lady, and the section of the Dark Lady sonnets". Shakespeare used Greek mythology to address love and despair in relationships. The material in Sonnets 153 and 154 has been shown to relate to the six-line epigram by the Byzantine poet known as Marianus Scholasticus, who published a collection of 3,500 poems called "The Greek Anthology". When translated, the epigram resembles Sonnets 153 and 154, addressing love and the story of Cupid, the torch, and the Nymph's attempt to extinguish the torch.
Document 14: The Nightingale's Song: The Nightingale's Song is a 1995 book by "Baltimore Sun" journalist Robert Timberg. It relates the military and political careers of five graduates of the United States Naval Academy, most of whom served during the Vietnam War in either the United States Navy or United States Marine Corps: John McCain, Bud McFarlane, Oliver North, John Poindexter, and Jim Webb. Timberg himself was also a Naval Academy graduate and served in Vietnam with the Marine Corps, where he was badly wounded.
Document 15: Lavinia Norcross Dickinson: Lavinia Norcross Dickinson (February 28, 1833 – August 31, 1899) was the younger sister of American poet Emily Dickinson.
ground_truth: Lavinia Greenlaw