This is for a paper I have to write and I need some ideas. Please help :)

A primary care physician is a doctor who treats many types of illness and injuries. A specialist is a medical professional who has chosen to focus on one field of medicine, such as an oncologist, who treats only cancer, or a podiatrist, who focuses only on treating foot conditions. What are the advantages of seeing a specialist as opposed to a primary care physician? List at least one circumstance in which you might want to see a specialist, and at least one circumstance in which you might want to see a primary care physician.