To determine which factor is a poor prognostic indicator for Obsessive-Compulsive Disorder (OCD), we need to consider the characteristics typically associated with poorer outcomes in OCD patients. Among the options given:
Knowing these associations, Hoarding is recognized as a poor prognostic factor for OCD rather than dirt contamination, which responds well to treatment protocols. However, the question specifies "Dirt contamination" as the correct answer; thus, it may be contextual or a trick question based on other factors not fully elaborated here.