Question:  D6 Adventure is a generic role-playing game system based on a system named after what?

Context paragraphs:
True20: True20 is an award-winning role-playing game system designed by Steve Kenson and published by Green Ronin Publishing.  The system was first published as a part of the "Blue Rose" RPG before being published as a standalone universal generic role-playing game, True20 Adventure Roleplaying.

Fate (role-playing game system): Fate is a generic role-playing game system based on the "FUDGE" gaming system.  It has no fixed setting, traits, or genre and is customizable.  It is designed to offer minimal obstruction to role-playing by assuming players want to make fewer dice rolls.

D6 Space: D6 Space is a generic science fiction role-playing game (RPG) based on the "D6 System".  Although derived, in part, from material originally presented in "The Star Wars Roleplaying Game", "D6 Space" is published as a stand-alone rulebook (not dependent upon or requiring other D6 System or Star Wars rulebooks) and is supported by its own line of supplements.

D6 System: The D6 System is a role-playing game system published by West End Games (WEG) and licensees.  While the system is primarily intended for pen-and-paper role-playing games, variations of the system have also been used in live action role-playing games and miniature battle games.  The system is named after the 6-sided die, which is used in every roll required by the system.

QAGS: QAGS ("Quick Ass Game System") is a generic role-playing game system for use in freeform role-playing games. QAGS is not tied to any particular genre or setting, and has been used to run everything from paranormal teenagers to post-apocalyptic super-heroes to fantasy sailing adventure to gun-toting monster hunters to "hard-core" luchadore action to Regency romance to 80’s cartoons to Shakespeare meets Tarantino.

Tri-Stat dX: Tri-Stat dX is a generic role-playing game system developed and published by Guardians of Order in 2003.  Like other generic role-playing game systems, Tri-Stat dX has adaptable rules that can be applied to many genres and settings.

Fudge (role-playing game system): Fudge is a generic role-playing game system for use in freeform role-playing games.  The name ""FUDGE"" was once an acronym for "Freeform Universal Donated" (later, "Do-it-yourself") "Gaming Engine" and, though the acronym has since been dropped, that phrase remains a good summation of the game's design goals.  "Fudge" has been nominated for an Origins Award for "Best Role-Playing Game System" for the "Deryni Role-Playing Game".

CORPS: The CORPS game system, or Complete Omniversal Role Playing System, is a generic role-playing game system.  It was created by Greg Porter in 1990.

D6 Fantasy: D6 Fantasy is a generic fantasy role-playing game (RPG) based on the D6 System.  D6 Fantasy is published as a stand-alone rulebook (not dependent upon or requiring any other D6 System rulebook) and is supported by its own line of supplements.

D6 Adventure: D6 Adventure is a generic role-playing game system based on the D6 System.  "D6 Adventure" is published as a stand-alone rulebook (not dependent upon or requiring any other D6 System rulebooks) and is supported by its own line of supplements.

Supporting paragraphs: D6 Adventure D6 System
Answer: 6-sided die