question: Q:A 55-year-old man comes to the physician because of a 2-day history of severe perianal pain and bright red blood in his stool. Examination shows a bulging, red nodule at the rim of the anal opening. Which of the following arteries is the most likely source of blood to the mass found during examination?? 
  {'A': 'Deep circumflex iliac', 'B': 'Internal pudendal', 'C': 'Median sacral', 'D': 'Inferior gluteal', 'E': 'Superior rectal'},