question: Q:A 26-year-old woman presents to the obstetrics ward to deliver her baby. The obstetrician establishes a pudendal nerve block via intravaginal injection of lidocaine near the tip of the ischial spine. From which of the following nerve roots does the pudendal nerve originate?? 
  {'A': 'L3-L4', 'B': 'L4-L5', 'C': 'L5-S1', 'D': 'L5-S2', 'E': 'S2-S4'},