This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Genetics And Genetic Disorders, Subject name: Pediatrics
Not a feature of Treacher-Collins syndrome: 
Select and explain. 
A. Deafness, B. Colobomas of lower eyelid, C. Hypoplasia of zygomatic bone, D. Mongoloid slant of palpable fissure
D: Mongoloid slant of palpable fissure
Answer: D: Mongoloid slant of palpable fissure 
Explanation: Ans. D. Mongoloid slant of palpable fissureMandibulofacial dysostosis is also known as Franceschetti-Klein syndrome or Treacher-Collins syndrome.Important features are as under:MicrognathiaColobomas of lower eyelidSunken cheek bonesBlind fistulas between the angles of mouth and earsDeformed pinnasAtypical hair growth extending towards cheekReceding chinLarge mouthFacial cleftsDeafnessAnti-mongoloid palpable fissureHypoplasia of mid face and zygomatic bone