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: Orthopaedics
[{'content': "Smith's fracture involves which bone : \nSelect and explain. \nA. Distal radius, B. Proximal ulna, C. Metatarsal, D. Patella", 'role': 'user'}, {'content': "Answer: A \nExplanation: Smith fracture is the fracture of distal third of radius with palmar displacement (reverse colle's fracture).", 'role': 'assistant'}]