This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ohopaedics Q Bank, Subject name: Orthopaedics
[{'content': "Fracture of base of first metacarpal joint without dislocation is called? \nSelect and explain. \nA. Bennett, B. Rolando, C. Jones, D. Boxer's", 'role': 'user'}, {'content': "Answer: B \nExplanation: The Rolando fracture is a comminuted intra-aicular fracture through the base of the first metacarpal bone. This is a fracture consisting of 3 distinct fragments; it is typically T- or Y-shaped. OTHER OPTIONS: Bennett fracture- fracture of base of 1st MC extending into CMC joint usually very unstable due to pull of Abductor pollicis longus Jones fracture- fracture of base of 5th MT Boxer's Fracture- fracture 5th MC", 'role': 'assistant'}]