Which is NOT a paired bone of the skull?

 # Which is NOT a paired bone of the skull?

a. Nasal.

b. Maxilla.

c. Lacrimal.

d. Sphenoid.

The correct answer is D. Sphenoid. 

Out of the 8 cranial bones, Parietal and Temporal are only paired. Occipital, Sphenoid, Frontal and Ethmoid are unpaired bones of the skull. Nasal, Maxilla and Lacrimal bones are paired though they don't constitute the cranium, they are facial bones.