question: Q:A 54-year-old woman with breast cancer comes to the physician because of redness and pain in the right breast. She has been undergoing ionizing radiation therapy daily for the past 2 weeks as adjuvant treatment for her breast cancer. Physical examination shows erythema, edema, and superficial desquamation of the skin along the right breast at the site of radiation. Sensation to light touch is intact. Which of the following is the primary mechanism of DNA repair responsible for preventing radiation-induced damage to neighboring neurons?? 
  {'A': 'Base excision repair', 'B': 'DNA mismatch repair', 'C': 'Nucleotide excision repair', 'D': 'Nonhomologous end joining repair', 'E': 'Homology-directed repair'},