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': 'Basic form of lingual plate major connector is: \nSelect and explain. \nA. Half pear-shaped., B. Pear-shaped., C. Straight bar., D. None.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]