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: Orthopaedics
[{'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 articular surface', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Calcaneonavicular ligament or spring ligament is a powerful ligament attahced posteriorly to the calcaneum and anteriorly to the navicular bone. So it is obvious that it will not participate in the formation of ankle joint.', 'role': 'assistant'}]