challenge: Which of the following is true about ATC code J05 Antivirals for systemic use?
  
  A. It is a therapeutic subgroup of the Anatomical Therapeutic Chemical Classification System.
  B. It is part of the anatomical group K Antineoplastic and immunomodulating agents.
  C. It is developed by the Food and Drug Administration (FDA).
  D. It is exclusively used for musculoskeletal system disorders.
  Answer: 