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': 'If placing the PPS too deeply, it will result in the displacement of the denture: \nSelect and explain. \nA. Anteriorly, B. Posteriorly, C. Laterally, D. Downwards', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]