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': 'Distobuccal flange of mandibular denture is influenced by: \nSelect and explain. \nA. Masseter, B. Buccinator, C. Temporalis, D. Platysma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]