Question: Which film has one actor playing the most roles, A Christmas Carol or My Dog Tulip?
Context: The Chimes: A Goblin Story of Some Bells that Rang an Old Year Out and a New Year In, a short novel by Charles Dickens, was written and published in 1844, one year after "A Christmas Carol" and one year before "The Cricket on the Hearth".  It is the second in his series of "Christmas books": five short books with strong social and moral messages that he published during the 1840s.  In addition to "A Christmas Carol" and "The Cricket on the Hearth", the Christmas books include "The Battle of Life" (1846) and "The Haunted Man and the Ghost's Bargain" (1848). Mister Magoo's Christmas Carol is a musical adaptation of Charles Dickens's famous short story "A Christmas Carol" starring the cartoon character Mr. Magoo.  Aside from the 1950 marionette special "The Spirit of Christmas", it was the first animated holiday program ever produced specifically for television, originally airing in December 1962, and the only one until the stop-motion special "Rudolph the Red-Nosed Reindeer" was first shown in December 1964.  The special also inspired the 1964 TV series "The Famous Adventures of Mr. Magoo".  It featured the voice of Jim Backus as Magoo, with voice-over appearances by Paul Frees, Morey Amsterdam, Joan Gardner, and Jack Cassidy. A Christmas Carol is an Australian 75-minute made-for-television animated film from Burbank Films Australia; a part of the studio's series of adaptations of Charles Dickens' works made from 1982 through 1985.  It was originally broadcast in 1982 through the Australian Nine Network Australia.  The film is based on Charles Dickens' classic English story, "A Christmas Carol", first published in 1843, and was adapted by Alexander Buzo.  It was produced by Eddy Graham and directed by Jean Tych.  Voice talent included Ron Haddrick, Phillip Hinton, Sean Hinton, Barbara Frawley, Robin Stewart, Liz Horne, Bill Conn, Derani Scarr, and Anne Haddy.  A second live-action, made-for-television title under the same name was produced in the same year.  All copyright in this film is currently owned by HS Holding Corporation who controls the licensing of this film. Sylvian Joululaulu (Swedish: "Sylvias hälsning från Sicilien"), "Sylvia's Christmas Song", is a poem by Zachris Topelius from 1853, which was composed to a christmas carol by Karl Collan.  The poem has been translated to Finnish by both Elina Vaara and Martti Korpilahti, and the latter one from 1918 is one of the most beloved Finnish christmas carols.  It has been chosen as the best Finnish christmas carol in the 1960s and again in 2002 in a poll by Yleisradio.  The poem is a part of the collection "Sylvian laulut": A Christmas Carol is a 2009 American 3D computer animated motion-capture fantasy film written and directed by Robert Zemeckis.  It is an adaptation of the Charles Dickens story of the same name and stars Jim Carrey in a multitude of roles, including Ebenezer Scrooge as a young, middle-aged, and old man, and the three ghosts who haunt Scrooge.  The film also features supporting roles done by Gary Oldman, Colin Firth, Bob Hoskins, Robin Wright, and Cary Elwes. A Christmas Carol is a 1999 British-American made-for-television film adaptation of Charles Dickens' famous novel "A Christmas Carol" that was first televised December 5, 1999 on TNT.  It was directed by David Jones and stars Patrick Stewart as Ebenezer Scrooge and Richard E. Grant as Bob Cratchit.  The film was produced after Patrick Stewart performed a series of successful theatrical readings of "A Christmas Carol" on Broadway and in London. A Diva's Christmas Carol is a 2000 VH1-original Christmas television film starring Vanessa L. Williams, Rozonda Thomas, Brian McNamara and Kathy Griffin.  The film is based on the Charles Dickens classic, "A Christmas Carol", featuring an ego-driven pop singer who gets a reality check by three Christmas spirits.  The film premiered on December 13, 2000. The Muppet Christmas Carol is a 1992 American-British musical fantasy comedy-drama film and an adaptation of Charles Dickens's 1843 novel "A Christmas Carol".  It is the fourth in a series of live-action musical films featuring The Muppets, with Michael Caine starring as Ebenezer Scrooge.  Although it is a comedic film with contemporary songs, "The Muppet Christmas Carol" otherwise follows Dickens's original story closely.  The film was produced and directed by Brian Henson for Jim Henson Productions and released by Walt Disney Pictures. My Dog Tulip is an American independent animated feature film based on the 1956 memoir of the same name by J. R. Ackerley, BBC editor, novelist and memoirist.  The film tells the story of Ackerley's fifteen-year relationship with his Alsatian dog (German Shepherd) "Queenie", who had been renamed "Tulip" for the book.  The film – geared toward an adult audience – was adapted, directed and animated by Paul Fierlinger with backgrounds and characters painted by his wife, Sandra Fierlinger. Dual role (also known as double role) refers to one actor playing two or more roles, which may be deliberately scripted in a play or film, or merely be a by-product of a low budget.  In a theatrical production where more than one actor plays multiple characters, it is sometimes referred to as an "Ironman" cast.  In film and television, a dual role is commonly used either for comic effect or to depict identical twins.
Answer: A Christmas Carol