The origin of dentine is

The correct answer is Mesodermal.

Key Points

• Dentine is the primary tissue of the vertebrate exoskeleton and thus is both an odontogenic (tooth-forming) and a skeletogenic (skeleton-forming) tissue.
• It is produced by dentine-forming cells known as odontoblasts.
• The composition of dentine is similar to that of bone, with 70% by weight of inorganic matter, 20% organic matter, and 10% water.

Additional Information

• The mesoderm is a germ layer which arises during gastrulation and is present between the ectoderm, which then turns into the skin and central nervous system cells, and the endoderm, which will produce the gut and the lungs  
• The endoderm is an embryonic germ layer that gives rise to tissues that form internal structures and organs.
• Ectoderm is the outermost of the three germ layers, or masses of cells, which appear in the early development phase of an animal embryo.