This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Foot, Subject name: Anatomy
[{'content': 'Ligament supporting the head of talus - \nSelect and explain. \nA. Talonavicular ligament, B. Cervical ligament, C. Plantar calcaneonavicular ligament, D. Deltoid ligament', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Plantar calcaneonavicular ligament o Spring ligament (Plantar calcaneonavicular ligament) connects the calcaneum with the navicular bone,o However, its principal job is to provide a sling for the talus, to support the head oftalus (though it has no attachment to talus).o This aids in supporting the weight of the body,o Weaknes or lengthening along this ligament can cause flat foot.", 'role': 'assistant'}]