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 has minimal tissue contact with the oral tissues: \nSelect and explain. \nA. Lingual plate., B. Lingual bar., C. Labial bar., D. Double lingual bar.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Lingual bar\n• The basic form is half pear shaped bar, with the broadest portion at the inferior border of the bar.\n• At least 8 mm of vertical space should be present between the active tissues of the floor of the mouth and gingival margins. The more inferior is the placement of lingual bar;\xa0less is the interference to the tongue.\n• It is the first preference in the selection of lingual major connector.\n• Surgical removal of the tori is usually required for a successful prognosis.\n• It has minimal contact with the oral tissues.\n• The sulcus must be relieved.\n• Sublingual bar is the modification of the lingual bar. It is placed inferior and posterior to that of lingual bar.', 'role': 'assistant'}]