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': 'The stability of the ankle joint is maintained by all of the following, except: \nSelect and explain. \nA. Plantar calcaneonavicular (spring) ligament, B. Deltoid ligament, C. Lateral ligament, D. Shape of the superior talar aicular surface', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Plantar calcaneonavicular (spring) ligament', 'role': 'assistant'}]