This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bone Tumour, Subject name: Orthopaedics
[{'content': 'Most commonly lesion associated with pathological fracture in hand is - \nSelect and explain. \nA. Enchondroma, B. Metastases, C. Osteoid osteoma, D. Osteochondroma', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Enchondroma Pathological fractures in hand* In hand pathological fractures are most commonly associated with benign bone tumors.* About 23 % of the bone tumors in hand present with pathological fractures.* The average age of presentation is 37 years.* The most common bone affected is the proximal phalynx, the fifth ray was involved in 44% of the patients.* Majority (approximately 88%) of the pathological fractures are caused by enchondromas.", 'role': 'assistant'}]