This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Skeletal System, Subject name: Radiology
Carpal fusion is seen in? 
Select and explain. 
A. Apert's syndrome, B. Rheumatoid arthritis, C. Post-traumatic cases, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Ans DThe most commonly involved bones are the lunate and triquetrum. Multiple carpal coalitions are often associated with other anomalies including Apert syndrome, Ellis-van Creveld syndrome, Holt-Oram syndrome, Turner's syndrome. Acquired intercarpal fusion can either be a consequence of an inflammatory arthropathy (e.g. rheumatoid arthritis, psoriatic arthritis, reactive arthritis) or injury, or due to surgical arthrodesis.