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Otocephaly is a developmental disorder of:

 # Otocephaly is a developmental disorder of:
 A. Zygoma
B. Jaw bone
C. Occipital bone
D. Parietal bone


The correct answer is B. Jaw bone.

Otocephaly, also known as agnathia–otocephaly complex, is a very rare and lethal cephalic disorder characterized by the absence of the mandible (agnathia), with the ears fused together just below the chin (synotia). It is caused by a disruption to the development of the first branchial arch. It occurs in every 1 in 70,000 embryos.  

Reference: WIKIPEDIA

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