A __________ earns a doctoral degree in medicine, provides therapy for those with severe disorders, and is able to prescribe medication for various disorders.

A psychiatrist is a medical doctor who earns a medical degree and can diagnose and treat mental disorders, including by prescribing medication. Psychologists may provide therapy but generally do not prescribe medication, while counselors and psychiatric nurses do not fit all the details in the question. The correct choice is psychiatrist.

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