question: Q:A 30-year-old primigravid woman at 16 weeks' gestation comes to the emergency department because of vaginal bleeding. She has had spotting for the last 2 days. She has had standard prenatal care. A viable uterine pregnancy was confirmed on ultrasonography during a prenatal care visit 2 weeks ago. She reports recurrent episodes of pain in her right wrist and both knees. Until pregnancy, she smoked one pack of cigarettes daily for the past 11 years. Pelvic examination shows an open cervical os and blood within the vaginal vault. Laboratory studies show:
  Hemoglobin 9.6 g/dL
  Leukocyte count 8,200/mm3
  Platelet count 140,000/mm3
  Prothrombin time 14 seconds
  Partial thromboplastin time 46 seconds
  Serum
  Na+ 136 mEq/L
  K+ 4.1 mEq/L
  Cl- 101 mEq/L
  Urea nitrogen 12 mg/dL
  Creatinine 1.3 mg/dL
  AST 20 U/L
  ALT 15 U/L
  Ultrasonography shows an intrauterine pregnancy and no fetal cardiac activity. Which of the following is the most likely explanation for this patient's examination findings?"? 
  {'A': 'Preeclampsia', 'B': 'Chromosomal abnormalities', 'C': 'Subchorionic hematoma', 'D': 'Hyperfibrinolysis', 'E': 'Placental thrombosis'},