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: Dental
[{'content': 'Rotational movement of Temperomandibular joint is due to: \nSelect and explain. \nA. Tight capsule., B. Loose capsule., C. Both, D. None.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]