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
[{'content': 'Which of the following tumor arise from the mesenchymal portion of the tooth germ, either from dental papilla,the follicle or the PDL: \nSelect and explain. \nA. Odontogenic myxoma., B. Adenomatoid odontogenic tumor., C. Pindborg tumor., D. Ameloblastoma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]