challenge: According to traditional Arab genealogists, who was the eponymous progenitor of the Iyad tribe?
  
  A. Rabi'a ibn Nizar ibn Ma'add ibn Adnan
  B. Anmar ibn Nizar ibn Ma'add ibn Adnan
  C. Mudar ibn Nizar ibn Ma'add ibn Adnan
  D. Iyad ibn Nizar ibn Ma'add ibn Adnan
  Answer: 