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': 'Muscle which has influence in the formation of buccal frenum of maxilla \nSelect and explain. \nA. Levator anguli oris, B. Quadratus labii superioris, C. Triangularis, D. Inferioris', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]