question: Q:A 42-year-old female complains of feeling anxious and worrying about nearly every aspect of her daily life. She cannot identify a specific cause for these symptoms and admits that this tension is accompanied by tiredness and difficulty falling asleep. To treat this problem, the patient is prescribed sertraline. She endorses a mild improvement with this medication, and over the next several months, her dose is increased to the maximum allowed dose with modest improvement. Her psychiatrist adds an adjunctive treatment, a medication which notably lacks any anticonvulsant or muscle relaxant properties. This drug most likely acts at which of the following receptors?? 
  {'A': 'GABA receptor', 'B': 'Alpha adrenergic receptor', 'C': 'Glycine receptor', 'D': '5HT-1A receptor', 'E': 'Beta adrenergic receptor'},