"Treehouse of Horror XI" is the first episode of "The Simpsons"<nowiki>'</nowiki> twelfth season and the 249th overall, and the eleventh Halloween episode. The episode features "G-G-Ghost D-D-Dad", "Scary Tales Can Come True" and "Night of the Dolphin" and was written by Rob LaZebnik (story by Mike Scully), John Frink and Don Payne and Carolyn Omine and directed by Matthew Nastuk.
Can we infer the following?
Treehouse of Horror XI is the eleventh Halloween Episode on the Simpsons
Yes