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: Surgery
[{'content': "Bennett's fracture is fracture dislocation of base of which of the following metacarpal? \nSelect and explain. \nA. 3rd, B. 4th, C. 1st, D. 2nd", 'role': 'user'}, {'content': "Answer: C \nExplanation: Bennett's fracture dislocation is paial aicular fracture of 1st metacarpal base with trapeziometacarpal dislocation/ subluxation. Also know Rolando's fracture dislocation: It is complete fracture of 1st metacarpal. It involves whole aicular surface with comminuted T or Y intraaicular fracture. Ref: Apley's 8/e, Page 631-32; Watson Jones: fracture & Joint injuries 6/e, Page 760-62; Rockwood & Green's Fracture in Adults 6/e, Page 836-42.", 'role': 'assistant'}]