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': 'Which of the following mandibular major connector is more esthetic, if wide anterior teeth diastema is present: \nSelect and explain. \nA. Lingual plate., B. Lingual bar., C. Continuous bar retainer., D. Labial bar.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]