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: Surgery
A young child, who has had abnormal development of the membranous bones has a broad skull with associated facial and dental anomalies. Which other bones is most likely to be also affected? 
Select and explain. 
A. Clavicles, B. Femurs, C. Metatarsals, D. Phalanges
A: Clavicles
Answer: A: Clavicles 
Explanation: In a syndrome called cleidocranial dysostosis, absence of pa of the clavicles accompanies a broad skull, and facial and dental anomalies. Note that you could also have answered this question by noting that of the bones listed, only the clavicles form by intramembranous ossification. The femurs, metatarsals, phalanges, and tibias are cailaginous (formed by endochondral ossification) rather than membranous bones.