Which symptom should a nurse recognize as being pertinent to a possible diagnosis of systemic lupus erythematosus (SLE)?

A. Bloody diarrhea: This is more characteristic of inflammatory bowel diseases like Ulcerative Colitis or Crohn’s disease. B. Butterfly rash of the face: The malar rash, or "butterfly rash," across the cheeks and bridge of the nose is a classic, hallmark sign of Systemic Lupus Erythematosus. C. Thinning hair: While alopecia can occur in SLE, it is less specific than the butterfly rash and can be caused by many other conditions (e.g., thyroid issues). D. Protruding abdomen: This is associated with ascites, liver failure, or malnutrition, not specifically with SLE.