Question: A 36-year-old woman presents with increased anxiety, palpitations, insomnia, and tremors for 2 days. A history of present illness reveals that she discontinued her anxiety medication because it made her too tired to perform her household chores. Her medical history is significant for generalized anxiety and depression, for which she used to take 'two kinds of anxiety pills.' She drinks 3 to 4 cups of coffee per day. She does not smoke and does not use illicit drugs. She reports occasional alcohol intake, no more than 2 to 4 times a month. Vital signs are blood pressure 145/95 mm Hg, heart rate 102 bpm, and respiratory rate 14 breaths/min. Physical examination reveals a restless, tremulous woman with a dysphoric mood. She constantly repeats that she is worried her children are being affected by her condition. Withdrawal from which of the following drugs is most likely responsible for the patient's signs and symptoms? A. Lorazepam B. Fluoxetine C. Caffeine D. Alcohol