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 direction of resorption of the maxillary ridge is: \nSelect and explain. \nA. Downwards and buccally, B. Upwards and lingually, C. Downwards and lingually, D. Upwards and buccally', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The maxilla resorbs in a superioposterior direction, and the mandible resorbs in an inferioanterior direction.\n\nThis will lead to confinement of maxillary arch within the mandibular arch in longstanding edentulous situations, giving a pseudo-class III ridge relationship.', 'role': 'assistant'}]