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: Anatomy
[{'content': 'Radio-Ulnar joint is \nSelect and explain. \nA. Pivot Type, B. Saddle Type, C. Ball And Socket Type, D. Fibrous Type', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]