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': 'When the soft palate is horizontal and extends posteriorly with minimal muscular activity, the posterior palatal seal should be: \nSelect and explain. \nA. Broad, B. Medium., C. High, D. Very narrow.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]