question: Q:A 61-year-old man with HIV comes to the physician because of a 3-week history of fatigue, nonproductive cough, and worsening shortness of breath. He appears ill. Pulse oximetry on room air shows an oxygen saturation of 89%. Laboratory studies show a CD4+ T-lymphocyte count of 67/mm3 (N ≥ 500/mm3) and an elevated HIV viral load. An x-ray of the chest shows diffuse interstitial infiltrates bilaterally. A bronchoalveolar lavage shows disc-shaped yeast cells. In addition to starting antiretroviral therapy, the appropriate treatment for the patient's current illness is initiated. Maintaining the patient on a medication to prevent recurrence of his current illness will also prevent which of the following conditions?? 
  {'A': 'Candidiasis', 'B': 'Toxoplasmosis', 'C': 'Cryptosporidiosis', 'D': 'Mycobacterium avium complex infection', 'E': 'Cytomegalovirus end-organ disease'},