This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
Which one of the following is NOT true of Ameloblastoma - 
Select and explain. 
A. Most common odontogenic tumour, B. Generally benign, C. Common in 3rd to 5th decade, D. Arises from mesenchymal tissue
D: Arises from mesenchymal tissue
Answer: D: Arises from mesenchymal tissue 
Explanation: Ameloblastoma

Ameloblastoma is the most common benign odontogenic tumor.
It is benign but locally invasive.
It is common in the 3rd to 5th decades of life.
Preferential sites are the mandible in the molar-ramus area and maxilla.
The tumor is epithelial in origin - arises from the dental epithelium of enamel.
Tumor with a histologic resemblance to ameloblastoma can occur occasionally in the long bone, like adamantinoma of the tibia.