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
Which of the following is not the diagnostic feature of Apert syndrome: 
Select and explain. 
A. Bicoronal craniosynostosis, B. Midface hypoplasia, C. Mandibular hypoplasia, D. Complex syndactyly
C: Mandibular hypoplasia
Answer: C: Mandibular hypoplasia 
Explanation: None