Final answer:
Option d, where the patient's primary care physician is paid a flat monthly fee, is an example of capitation in health care.
Step-by-step explanation:
An example of capitation in health care is option d. The patient's primary care physician is paid a flat monthly fee no matter how many appointments are scheduled with the patient. In this payment model, the physician receives a fixed amount per patient enrolled in the plan, regardless of the number of services provided. This incentivizes the physician to manage the patient's care efficiently and prevent unnecessary appointments or treatments.