Final answer:
A psychiatrist is the best professional to address psychological disorders initially with medication.
Step-by-step explanation:
The correct answer is A. Psychiatrist.
A psychiatrist is a medical doctor who specializes in the diagnosis, treatment, and management of mental disorders. They have the authority to prescribe medication to address psychological disorders. Psychiatrists typically work in conjunction with other professionals, such as psychologists and counselors, to provide comprehensive care for individuals with psychological disorders.