Which of the following is an EXCLUSION for the self-care treatment of musculoskeletal pain?

A. Patient is 13 years old: Adolescents can generally use self-care measures for mild musculoskeletal pain if no red flags are present. Age alone, especially above 12 years, does not automatically exclude a patient from appropriate OTC or non-pharmacologic management. B. Arm pain that has lasted 5 days: Acute musculoskeletal pain lasting less than 7 days without worsening severity or associated complications is typically appropriate for self-treatment. Monitoring and conservative management are usually sufficient within this timeframe. C. Pelvic pain for 3 days: Pelvic pain is not typically classified as simple musculoskeletal pain and may indicate underlying conditions involving reproductive, urinary, or gastrointestinal systems. This requires further medical evaluation rather than self-care, making it an exclusion. D. Pain Scale Score 4/10: Mild to moderate pain (generally ≤5/10) is considered appropriate for self-care with analgesics and supportive measures. This level of pain does not suggest severe pathology requiring immediate medical evaluation.