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 maximum depression of the soft palate is recorded when Frankfort horizontal plane is \nSelect and explain. \nA. 30° below the horizontal plane, B. 10° below the horizontal plane, C. 60° below the horizontal plane, D. 80° below the horizontal plane', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]