question: Q:A 43-year-old woman comes to the physician because of a 3-month history of tremor, diarrhea, and a 5-kg (11-lb) weight loss. Her pulse is 110/min. Examination shows protrusion of the eyeball when looking forward. A bruit is heard over the anterior neck on auscultation. Serum studies show autoantibodies to the thyroid-stimulating hormone receptor. The patient decides to undergo definitive treatment for her condition with a radioactive tracer. The success of this treatment directly depends on the activity of which of the following?? 
  {'A': 'Transmembrane carrier', 'B': 'Lysosomal protease', 'C': 'Hormone-activating enzyme', 'D': 'Binding globulin', 'E': 'Anion-oxidizing enzyme'},