Question: Lucio Fulci was best known for films in a subgenre of what basic genre?

Context paragraphs:
The Conspiracy of Torture: The Conspiracy of Torture (Italian: Beatrice Cenci ) is a 1969 Italian historical drama film directed by iconic horror film director Lucio Fulci, starring Adrienne La Russa and Tomas Milian.  It depicts real life events of Francesco and Beatrice Cenci, emphasizing the horrific elements of the story.  Fulci always considered this one of his favorite films, as did his wife Maria Fulci (who committed suicide soon after this film was released in Italy in 1969.)  The film was only released in the USA in 1976, as "Conspiracy of Torture".

A Cat in the Brain: A Cat in the Brain (Italian: Un gatto nel cervello; also known as Nightmare Concert and I volti del terrore) is a 1990 Italian horror film written and directed by the "Italian godfather of gore" Lucio Fulci.  "A Cat in the Brain" is one of Lucio Fulci's final films and is notable for self-reflexively summing up his career.  The film is a meta-film in which the director appears playing himself, a tortured horror filmmaker who is driven by the violent visions that he experiences both behind the camera and off the set.  Feeling like he's losing his grip on reality and disturbed by murderous fantasies, Fulci consults a psychotherapist.  The "shrink" exploits the director's vulnerabilities to his own murderous ends.

Splatter film: A splatter film or gore film is a subgenre of horror film that deliberately focuses on graphic portrayals of gore and graphic violence.  These films, usually through the use of special effects, display a fascination with the vulnerability of the human body and the theatricality of its mutilation.  The term "splatter cinema" was coined by George A. Romero to describe his film "Dawn of the Dead", though "Dawn of the Dead" is generally considered by critics to have higher aspirations, such as social commentary, than to be simply exploitative for its own sake.

The New York Ripper: The New York Ripper (Italian: Lo squartatore di New York) is a 1982 Italian giallo film directed and co-written by Lucio Fulci.  The film score was written by Francesco De Masi.  The film was banned in many countries or released as an "adults-only" movie after heavy editing.  Whilst most of Lucio Fulci's other films have been released uncut in the United Kingdom, "The New York Ripper" remains censored to this day, even for its 2011 DVD and Blu-ray releases.

Don't Torture a Duckling: Don't Torture a Duckling (Italian: "Non si sevizia un paperino") is a 1972 Italian giallo film directed by Lucio Fulci, starring Florinda Bolkan, Tomas Milian and Barbara Bouchet.  It is significant within Fulci's filmography as it is one of the first in which he began using violent gore effects, something he would continue to do in his later films, most notably "Zombi 2", "The Beyond" and "City of the Living Dead".  The soundtrack was composed by Riz Ortolani and features vocals by Ornella Vanoni.

Door to Silence: Door to Silence (Italian: "Le porte del silenzio"), also known as Door Into Silence, is a 1991 Italian horror film written and directed by Lucio Fulci and produced by Joe D'Amato.  It stars John Savage.  This is the last film directed by Fulci.

Herschell Gordon Lewis: Herschell Gordon Lewis (June 15, 1926 – September 26, 2016) was an American filmmaker, best known for creating the "splatter" subgenre of horror films.  He is often called the "Godfather of Gore" (a title also given to Lucio Fulci), though his film career included works in a range of exploitation film genres including juvenile delinquent films, nudie-cuties, two children's films and at least one rural comedy.  On Lewis' career, AllMovie wrote: "With his better-known gore films, Herschell Gordon Lewis was a pioneer, going farther than anyone else dared, probing the depths of disgust and discomfort onscreen with more bad taste and imagination than anyone of his era."

Lucio Fulci: Lucio Fulci (] ; 17 June 1927 – 13 March 1996) was an Italian film director, screenwriter and actor.  He is perhaps best known for his gore films, including "Zombi 2" (1979) and "The Beyond" (1981), although he made films in genres as diverse as giallo, western and comedy.  Fulci is known as the "Godfather of Gore", a title also given to Herschell Gordon Lewis.

Challenge to White Fang: The Return of White Fang (Italian: "Il ritorno di Zanna Bianca" ) is a 1974 film directed by Lucio Fulci.  It was part of a trend of films inspired by "Call of the Wild" (1972), which was a surprise hit in Italy.  Other European productions followed including "Hellhounds of Alaska", Harald Reinl's "Cry of the Black Wolves", and "White Fang" and "Return of White Fang" both by Fulci.

Murder Rock: Murder Rock (Italian: Murderock - uccide a passo di danza; also known as Murder-Rock: Dancing Death, Slashdance and The Demon Is Loose!)  is a 1984 Italian giallo film starring Olga Karlatos and Ray Lovelock, and written and directed by Lucio Fulci.  Fulci recalled the producer forced him to turn the film into a musical with the music of Keith Emerson due to the success of "Flashdance".

Supporting paragraphs: Lucio Fulci Splatter film
Answer: horror