Final answer:
Physical therapy after a stroke is an example of the tertiary level of preventive care.
Step-by-step explanation:
Physical therapy after a stroke is an example of the tertiary level of preventive care. Tertiary care refers to specialized medical interventions and rehabilitation services that are provided to individuals who have already experienced a health condition or injury, such as a stroke. In this case, physical therapy is aimed at helping the individual regain their physical function and improve their quality of life after the stroke.