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': 'Decreased interincisal angle indicates: \nSelect and explain. \nA. Retrusion of teeth, B. Protrusion of teeth, C. Vertical overlap, D. Horizontal overlap', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]