The suture between the two halves of the Frontal
bones is: (A) Metopic, (B) Symphysis, (C) Mendosal, (D) Coronal
Answer is A. Frontal bone ossifies in membrane. 
It develops from 2 centres near frontal eminences, during 8th week of intrauterine life.
At birth, the bone is in 2 halves, separated in the midline by a suture, known as metopic suture, which soon starts to fuse.
The metopic suture occasionally persists in 3 to 8% of individuals.