question: Q:A 36-year-old nulligravid woman comes to the physician because of a 1-year history of pelvic discomfort and heavy menstrual bleeding. The pain is dull and pressure-like and occurs intermittently; the patient is asymptomatic between episodes. Menses occur at regular 30-day intervals and last 8 days with heavy flow. Her last menstrual period ended 5 days ago. She is sexually active and does not use contraception. Her temperature is 36.8°C (98.8°F), pulse is 76/min, and blood pressure is 106/68 mm Hg. Pelvic examination shows white cervical mucus and a firm, irregularly-shaped uterus consistent in size with a 5-week gestation. A spot urine pregnancy test is negative. Which of the following is the most appropriate next step in diagnosis?? 
  {'A': 'Pelvic radiograph', 'B': 'Laparoscopy', 'C': 'Pelvic MRI', 'D': 'Pelvic ultrasound', 'E': 'Repeat β-HCG test'},