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': 'The three main vertical pillars of trajectories of force arising from the alveolar process and ending in the base of the skull are all except: \nSelect and explain. \nA. Canine pillar, B. Zygomatic pillar, C. Pterygoid pillar, D. Condylar pillar', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]