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
Which of the following is a feature of Treacher Collins syndrome ? 
Select and explain. 
A. Hypoplasia of frontal bone, B. Coloboma of eyelid, C. Low arched palate, D. All of the above
B: Coloboma of eyelid
Answer: B: Coloboma of eyelid 
Explanation: 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.