question: Q:A 34-year-old female medical professional who works for a non-governmental organization visits her primary care provider for a routine health check-up. She made a recent trip to Sub-Saharan Africa where she participated in a humanitarian medical project. Her medical history and physical examination are unremarkable. A chest radiograph and a tuberculin skin test (PPD) are ordered. The chest radiograph is performed at the side and the PPD reaction measures 12 mm after 72 hours. Which of the following mechanisms is involved in the skin test reaction?? 
  {'A': 'Formation of immune complexes', 'B': 'Opsonization', 'C': 'Complement activation', 'D': 'Th1-mediated cytotoxicity', 'E': 'IgE cross-linking'},