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: ENT
[{'content': 'The shape of septal cailage is: \nSelect and explain. \nA. Triangular, B. Quadrilateral, C. Oval, D. Hexagonal', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The septal nasal cailage, (cailage of the septum or quadrangular cailage) is composed of hyaline cailage. It is somewhat quadrilateral in form, thicker at its margins than at its center, and completes the separation between the nasal cavities in front.', 'role': 'assistant'}]