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': 'Which of the following is a synovial joint of the condylar variety - \nSelect and explain. \nA. First carpometacarpal joint, B. Metacarpophalangeal joint, C. Interphalangeal joint, D. Radiocarpal joint', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Metacarpophalangeal joints are ellipsoid joints functionally, but structurally they belong to condylar joints.', 'role': 'assistant'}]