This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Upper limb, Subject name: Anatomy
[{'content': "Bennet's Fracture involves \nSelect and explain. \nA. Base of Ist metacarpal, B. Neck of Ist metacarpal, C. Base of Vth metacarpal, D. Neck of Vth metacarpal", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Fracture of the base of the first metacarpal is called Bennett&;s fracture.It involves the anterior pa of the base, and is caused by a force along its long axis. The thumb is forced into a semiflexed position and cannot be opposed. The fist cannot be clenchedReference: Vishram Singh Anatomy; 2nd edition; Page no: 32', 'role': 'assistant'}]