(A) a
student nurse, medical or dental intern, resident-in-training,
student dietitian,
student physical therapist, and
student occupational therapist, assigned or attached to a hospital, clinic, or medical or dental laboratory operated by an agency; and
(B) any other
student-employee, assigned or attached primarily for training purposes to a hospital, clinic, or medical or dental laboratory operated by an agency, who is designated by the head of the agency with the approval of the Office of Personnel Management.