question: Q:A 20-year-old man comes to the clinic complaining of fever and a sore throat for 5 days. He receives oral penicillin from his primary doctor. After a day of antibiotic treatment, he developed gross hematuria. As a child, he recalls having multiple episodes of hematuria. The vital signs are within normal limits. On physical examination, pharyngeal edema and cervical lymphadenopathy are present. His laboratory examination reveals the following:
  WBC 11,000/mm3
  Neutrophils 76%
  Lymphocytes 23%
  Eosinophils 1%
  Platelets 150,000/mm3
  Hemoglobin 14 g/dL
  Hct 41.2%
  BUN 16 mg/dL
  Creatinine 0.9 mg/dL
  ASO titer 100
  Urinalysis shows hematuria but no proteinuria. Immunofluorescence shows granular IgA immune complex deposits in the mesangium. Hepatitis B, hepatitis C, and HIV serology are negative. ASO titers and C3 levels are within normal limits. What is the most likely diagnosis?? 
  {'A': 'Penicillin-induced hypersensitivity reaction', 'B': 'Berger’s disease', 'C': 'Post-streptococcal glomerulonephritis', 'D': 'Hemolytic uremic syndrome', 'E': 'Celiac disease'},