question: Q:A 32-year-old man comes to the physician because of a 3-week history of cough, weight loss, and night sweats. He migrated from Sri Lanka 6 months ago. He appears emaciated. His temperature is 38.1°C (100.5°F). Physical examination shows enlargement of the right supraclavicular lymph node. Chest and abdominal examination show no abnormalities. An interferon-gamma assay is positive. A biopsy specimen of the cervical lymph node is most likely to show the causal organism in which of the following locations?? 
  {'A': 'Germinal center', 'B': 'Medullary sinus', 'C': 'Paracortex', 'D': 'Mantle zone', 'E': 'Periarteriolar lymphatic sheath'},