This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
[{'content': 'Giant cell tumor of tendon sheath is - \nSelect and explain. \nA. Traumatic, B. Infective, C. Malignant tumor, D. Benign tumor', 'role': 'user'}, {'content': 'Answer: D \nExplanation: It is also known as giant-cell synovioma and localized nodular tenosynovitis.\nThey are the second most common benign tumor of the hand.\nThey most commonly occur in patients aged 30-50 years.\nThey are associated with degenerative joint disease.\nTypically, these masses occur along the volar aspect of the hand and fingers and are most commonly adjacent to the DIP joint.\nSurgery to remove the tumor is a common treatment, though the tumor may recur.', 'role': 'assistant'}]