Question: Who is the creator and writer of the sitcom that features a character named Cassandra Trotter?

Context paragraphs:
Wanda Ventham: Wanda Ventham (born 5 August 1935) is an English actress, known primarily for her role as Colonel Virginia Lake in the 1970s science-fiction television series "UFO", and for her recurring role as Cassandra Trotter's mother Pamela Parry in the sitcom "Only Fools and Horses" from 1989–92.  She also appeared in two episodes of "The Saint" alongside Roger Moore.

Rodney Trotter: Rodney Charlton "Rodders" Trotter is a fictional character in the long running BBC sitcom "Only Fools and Horses", played by Nicholas Lyndhurst.  He was named after Rod Taylor and Charlton Athletic.

Lois Griffin: Lois Patrice Griffin (née Pewterschmidt) is one of the main characters of the American animated television series "Family Guy".  She is voiced by writer Alex Borstein and first appeared on television, along with the rest of the family, in the 15-minute short on December 20, 1998.  Lois was created and designed by series creator Seth MacFarlane.  MacFarlane was asked to pitch a pilot to the Fox Broadcasting Company based on "Larry and Steve", a short he made which featured a middle-aged character named Larry and an intellectual dog, Steve.  After the pilot was given the green light, the Griffin family appeared on the episode "Death Has a Shadow".

Rock &amp; Chips: Rock & Chips is a British television comedy-drama and a prequel to the sitcom "Only Fools and Horses".  Set in 1960s Peckham, it focuses primarily on the lives of Del Trotter, Freddie Robdal and Joan and Reg Trotter.  Nicholas Lyndhurst, who played Rodney in "Only Fools and Horses", plays Robdal alongside James Buckley (Del Boy), Kellie Bright (Joan), Shaun Dingwall (Reg) and Phil Daniels (Grandad).  The Shazam Productions and BBC co-production was written by "Only Fools and Horses" creator John Sullivan, directed by Dewi Humphreys and produced by Gareth Gwenlan.

Near to the Wild Heart: Near to the Wild Heart ("Perto do coração selvagem") is Clarice Lispector's first novel, written from March to November 1942 and published around her twenty-third birthday in December 1943.  The novel, written in a stream-of-consciousness style reminiscent of the English-language Modernists, centers on the childhood and early adulthood of a character named Joana, who bears strong resemblance to her author: ""Madame Bovary, c'est moi"", Lispector said, quoting Flaubert, when asked about the similarities.  The book, particularly its revolutionary language, brought its young, unknown creator to great prominence in Brazilian letters and earned her the prestigious Graça Aranha Prize.

Cassandra Trotter: Cassandra Louise Trotter (née Parry; born 16 June 1966) is a fictional character from the British sitcom "Only Fools and Horses".  She was portrayed by Gwyneth Strong.

Peter Griffin: Peter Griffin is the main protagonist and title character of the American animated sitcom "Family Guy".  He is voiced by cartoonist Seth MacFarlane and first appeared on television, along with the rest of the family, in the 15-minute pilot pitch of "Family Guy" on December 20, 1998.  Peter was created and designed by MacFarlane himself.  MacFarlane was asked to pitch a pilot to the Fox Broadcasting Company based on "Larry & Steve", a short made by MacFarlane which featured a middle-aged character named Larry and an intellectual dog, Steve.  After the pilot was given the green light, the Griffin family appeared in the episode "Death Has a Shadow".

The Shaggy Dog (2006 film): The Shaggy Dog is a 2006 American family comedy film directed by Brian Robbins and written by Geoff Rodkey, Jack Amiel, Michael Begler, Cormac Wibberley and Marianne Wibberley.  It is the second remake of the 1959 film of the same name, which was first remade as a television film in 1994.  Both the 1959 and 1994 features, as well as the 1976 theatrical sequel and the 1987 television sequel, had a character named Wilby Daniels transforming into an Old English Sheepdog, whereas this remake presents a character named Dave Douglas transforming into a Bearded Collie.  It stars Tim Allen, Robert Downey, Jr., Kristin Davis, Danny Glover, Spencer Breslin, Jane Curtin, Zena Grey and Philip Baker Hall.

Only Fools and Horses: Only Fools and Horses is a British television sitcom created and written by John Sullivan.  Seven series were originally broadcast on BBC One in the United Kingdom from 1981 to 1991, with sixteen sporadic Christmas specials aired until the end of the show in 2003.  Episodes are regularly repeated on UKTV comedy channel Gold, Yesterday and occasionally repeated on BBC One.

Cassandra Webb: "For the fictional character named Cassandra Webb, see Madame Web."

Supporting paragraphs: Cassandra Trotter Only Fools and Horses
Answer: John Sullivan