question: Q:A 45-year-old woman has a 2-week history of increased anxiety, abdominal discomfort, irritability, and difficulty concentrating; she was robbed at knifepoint in a parking lot 3 weeks ago. She takes levothyroxine for hypothyroidism and uses an over-the-counter inhaler as needed for exercise-induced asthma. Her blood pressure is 140/80 mm Hg, and pulse is 100/min. Examination shows dry skin and hair. She is cooperative but appears anxious, glancing around quickly when a loud noise is heard outside the office. Leukocyte count is 12,000/mm3 , and serum thyroid-stimulating hormone concentration is 5.0 μU/mL. An ECG shows sinus tachycardia. Which of the following is the most likely diagnosis?? 
  A:Acute stress disorder;B:Agoraphobia;C:Generalized anxiety disorder;D:Hypothyroidism