Which of the following is NOT one of the five disciplines defined under Title X?

Title X of the Housing and Community Development Act focuses on reducing lead-based paint hazards, particularly in residential properties. Within this framework, five key disciplines are established to address lead exposure and ensure compliance with the regulations. The disciplines include Inspector, Risk Assessor, Project Designer, Abatement Contractor, and Lead Supervisor.

The role of the Contractor, which encompasses professionals tasked with managing lead abatement projects, is an essential part of the lead hazard control process. However, "Contractor" as a term does not specifically align with the defined disciplines listed under Title X, which are centered around assessment, inspection, and design rather than a general contracting role.

Therefore, the Contractor does not uniquely fit into the five specified roles, making this option the one that is not part of the formal designations under Title X. Understanding these disciplines is crucial for compliance and safety in managing lead hazards in homes, emphasizing the importance of each role in protecting public health.