C. You take up residence in a medical or health institution.
In the medical and health fields, a residency is a period of supervised practical training that medical graduates undergo to become certified specialists in a particular field. During this period, residents work in hospitals, clinics, or other medical institutions, where they receive hands-on training and supervision from experienced physicians or other healthcare professionals. The residency is an essential part of the medical training process and is required for medical licensure and board certification.