Given the question: Information:  - The Playbirds is a 1978 British sexploitation film made by Irish - born director Willy Roe and starring 1970s ' pin - up Mary Millington alongside Glynn Edwards , Suzy Mandel and Windsor Davies . When a series of female centrefolds from the glamour magazine Playbirds are murdered by an obsessive fanatic , Scotland Yard are called to investigate the lurid world of pornography .  - It Ain't Half Hot Mum is a BBC television sitcom, about the adventures of a Royal Artillery Concert Party, broadcast on the BBC between 1974 and 1981, and written by Jimmy Perry and David Croft. It was set in India and Burma, during the last months of the Second World War, starting just prior to V-E Day in 1945 (the German surrender is announced in an early episode).  - The Benny Hill Show is a British comedy television show that starred Benny Hill and aired in various forms between 15 January 1955 and 30 May 1991 in over 140 countries. The show focused on sketches that were full of slapstick, mime, parody, and double-entendre. Thames Television cancelled production of the show in 1989 due to declining ratings and large production costs at £450,000 per show.  - Suzy Mandel (born 6 March 1953) is the stage name of a former actress and model best known for her roles in such 1970s British sex comedies as "Confessions of a Driving Instructor" (1976), "Intimate Games" (1976), "Come Play with Me" (1977), "The Playbirds" (1978), and "Adventures of a Plumber's Mate" (1978), and for her appearances on "The Benny Hill Show".  - Adventures of a Plumber's Mate is a 1978 British sex comedy film starring Christopher Neil as Sid South. Following on from "Adventures of a Taxi Driver" and "Adventures of a Private Eye", this was the final of the series which attempted to occupy the same market position as the better-known and more successful "Confessions" series starring Robin Askwith.  - Windsor Davies (born 28 August 1930) is a retired British actor who is best known for playing the part of Battery Sergeant Major Williams in the British sitcom "It Ain't Half Hot Mum" (197481).  - Yootha Joyce Needham (20 August 1927  24 August 1980), credited as Yootha Joyce, was a British actress best known for playing Mildred Roper in sitcom "Man About the House" and its spin-off "George and Mildred".  - Mary Ruth Maxted (née Quilter; 30 November 1945  19 August 1979), known professionally as Mary Millington, was an English model and pornographic actress. Her appearance in the short softcore film "Sex is My Business" led to her meeting with magazine publisher David Sullivan, who promoted her widely as a model, and featured her in the softcore comedy "Come Play With Me", which ran for a record-breaking four years at the same cinema. But she soon found herself being replaced by younger models, and this led to a downward spiral of drug addiction, shoplifting and debt. At 33, she died of an overdose.  - Glynn Edwards (born 2 February 1931) is a British actor. He was married to late well-known British actress Yootha Joyce.    What object entity has the relation of 'producer' with the subject 'the playbirds'?   Choices: - bbc  - christopher neil  - david sullivan  - man  - various
The answer is:
david sullivan