Mental spines provide attachment to: (A) Genioglossus, (B) Anterior & posterior bellies of digastric, (C) Mylohyoid, (D) Superior constrictor of pharynx
Answer is A. Mental spine also known as genial tubercle, is a small bony elevation found on the inner surface of mandible, in the midline.
There are 4 mental spines - superior and inferior pair.


Superior genial tubercle gives origin to genioglossus muscle of tongue.
Inferior genial tubercle gives origin to geniohyoid muscle.