Final answer:
The treatment of choice for a severely depressed geriatric patient who is not eating or drinking can vary depending on the individual's specific symptoms and medical history. However, one commonly used intervention is the prescription of antidepressant medications.
Step-by-step explanation:
The treatment of choice for a severely depressed geriatric patient who is not eating or drinking can vary depending on the individual's specific symptoms and medical history. However, one commonly used intervention is the prescription of antidepressant medications. In this case, the most suitable options would be Mirtazapine or Paroxetine, as they have shown efficacy in improving appetite and promoting weight gain in depressed patients. Venlafaxine and Fluoxetine are not typically recommended for this particular symptom presentation.