What type of facility is referred to as a mental institution?

A mental institution is specifically designed to provide care and treatment for individuals who are experiencing serious mental illnesses. These facilities are equipped with trained professionals who offer therapeutic interventions, medication management, and support services to help patients manage their conditions. This setting is crucial for individuals who may require a structured environment to receive comprehensive care for their mental health needs.

The other choices refer to different types of organizations or facilities that do not align with the function of a mental institution. For example, a place for political discussions would involve debates or forums on political matters, while an organization for skilled workers typically pertains to labor unions or professional associations. Additionally, a building for public gatherings is associated with events or meetings but is not specifically focused on mental health treatment. Therefore, the answer correctly identifies the primary role and purpose of a mental institution.