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': "Game Keeper's thumb is \nSelect and explain. \nA. Ulnar collateral ligament injury of MCP Joint, B. Radial collateral ligament injury of MCP joint, C. Radial collateral ligament injury of CMC joint, D. Ulnar collateral ligament injury of CMC joint", 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Ulnar collateral ligament injury of MCP Joint', 'role': 'assistant'}]