question: Q:A 15-year-old girl presents with menorrhagia for the last 4 months. The patient’s mother says that she just started getting her period 4 months ago, which have been heavy and prolonged. The patient does recall getting a tooth extracted 3 years ago that was complicated by persistent bleeding afterward. She has no other significant past medical history and takes no current medications. Her vital signs include: blood pressure 118/76 mm Hg, respirations 17/min, pulse 64/min, temperature 36.7°C (98.0°F). Physical examination is unremarkable. Which of the following laboratory tests is most likely to be of the greatest diagnostic value in the workup of this patient?? 
  {'A': 'Factor IX assay', 'B': 'Partial thromboplastin time (PTT)', 'C': 'Anti-cardiolipin antibodies', 'D': 'Ro/La autoantibodies', 'E': 'Prothrombin time (PT)'},