This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Orbital Disorders, Subject name: Ophthalmology
[{'content': 'Which of the following is a feature of Treacher Collins syndrome ? \nSelect and explain. \nA. Hypoplasia of frontal bone, B. Coloboma of eyelid, C. Low arched palate, D. All of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Coloboma of eyelid is one of the ocular feature of Treacher Collins syndrome Mandibulofacial dysostosis ( aka Treacher Collins syndrome) Refers to a condition resulting from hypoplasia of zygoma and mandible. Features of Treacher Collins syndrome : * Indistinct inferior orbital margin * Coloboma of the lower eyelid * Anti-mongoloid slant * Macrostomia with high-arched palate * External ear deformity * Bird-like face.', 'role': 'assistant'}]