A. Fibromyalgia: Fibromyalgia is characterized by widespread musculoskeletal pain, fatigue, and tender points, but it does not cause bony nodules or joint deformities. The presence of Heberden’s nodes is not associated with this condition. B. Osteoarthritis: Heberden’s nodes are bony enlargements of the distal interphalangeal joints commonly seen in osteoarthritis. They result from cartilage degeneration and bone remodeling, and are a hallmark sign of osteoarthritic joint changes. C. Rheumatoid arthritis: Rheumatoid arthritis primarily affects the proximal interphalangeal and metacarpophalangeal joints with symmetric inflammation. Nodules in RA are typically subcutaneous, not bony, and Heberden’s nodes are not characteristic. D. Systemic lupus erythematosus: SLE can cause joint pain and swelling, but it does not lead to Heberden’s nodes or osteoarthritic bony changes. Joint involvement in SLE is typically non-erosive and inflammatory rather than degenerative.