premise: "Merry Christmas, Charlie Manson!" is the sixteenth episode in the second season of the American animated television series "South Park". The 29th episode of the series overall, it originally aired on Comedy Central in the United States on December 9, 1998. The episode was written by series co-creator Trey Parker, along with Nancy M. Pimental, and directed by Eric Stough.
hypothesis: The second season of South Park has 18 episodes and was written by series co-creator Trey Parker, along with Nancy M. Pimental, and directed by Eric Stough.
reason: the statement can not be verified by the passage so it is neither but the AI identified 18 episodes in place of 16th episode and marked it as incorrect. 