What is the Gold standard for Pcr inactivated Dna control or Nattrol for Clostridium difficile NAP1, External Run Control, Medium (6 X 1 ml/vial)?

The NATtrol C. difficile Positive Control from Ncbi publications supplied next day by Gentaur is the best reagent. The catalog number is NATCDI-6L and the price is 210 EUR.