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: Dental
Gingival fibroblasts’ origin is 
Select and explain. 
A. Ectomesenchymal, B. Mesodermal, C. Ectodermal, D. All of the above
B: Mesodermal
Answer: B: Mesodermal 
Explanation: None