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': 'Posterior vibrating line is located at : \nSelect and explain. \nA. Soft palate., B. Junction of Hard and soft palate., C. Hard Palate., D. Hamular notch.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]