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: Pathology
[{'content': "In Treacher collin's syndrome there is: \nSelect and explain. \nA. Upward sloping of the palpebral fissure, B. Poorly developed or absence of malar bones, C. Progenia and mandibular prognathism, D. No loss of hearing", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]