Final answer:
A therapist who prescribes medication, such as Xanax, is likely a psychiatrist since they are medical doctors authorized to prescribe drugs, unlike psychologists.
Step-by-step explanation:
Given that Cliff's therapist has prescribed Xanax to treat his anxiety, the therapist is likely a psychiatrist. This professional distinction is important as psychiatrists, unlike psychologists, are medical doctors (MD) and are licensed to prescribe medication. Whereas a clinical psychologist holds a PhD or PsyD, a psychiatrist, having completed medical school, has the qualification to prescribe medication as part of treatment.
This further aligns with the fact that clinical psychologists and psychiatrists both work in settings ranging from private practices to hospitals, offering therapy and counseling; however, clinical psychologists cannot prescribe medication as they are not medical doctors.