challenge: What are the two sources that the currently accepted taxonomy of Thermoplasmata is based on?
  
  A. List of Prokaryotic names with Standing in Nomenclature (LPSN) and Encyclopedia Britannica
  B. List of Prokaryotic names with Standing in Nomenclature (LPSN) and National Center for Biotechnology Information (NCBI)
  C. National Center for Biotechnology Information (NCBI) and Wikipedia
  D. World Health Organization (WHO) and Centers for Disease Control and Prevention (CDC)
  Answer: 