Final answer:
The true statement about DSM IV is that it provides criteria for diagnosing mental disorders. It is not focused on physical health diagnoses, not primarily used in veterinary medicine, and while it is less used now, it was not entirely discontinued since the DSM-5's release.
Step-by-step explanation:
Among the options presented about the DSM IV (Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition), the true statement is that it provides criteria for diagnosing mental disorders. Option 'a' is incorrect as the DSM IV focuses on mental health diagnoses rather than physical health. Option 'b' is partly misleading; while DSM IV itself is less frequently used since the publication of its successor, DSM-5, it was a widely recognized tool for diagnosing mental disorders before that. Option 'd' is incorrect because the DSM is used in human medicine, not veterinary medicine. The DSM IV was indeed a critical resource for clinicians to diagnose a range of mental disorders, including substance use disorders, and it was succeeded by the DSM-5, which provided updated criteria and classifications for mental disorders.