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 is the peculiar feature of Pierre Robin sequence: \nSelect and explain. \nA. V shaped cleft palate., B. U shaped cleft palate., C. L shaped cleft palate., D. Absence of cleft palate.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]