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
Which of the following are the predominant connective tissue cells of the periodontal Ligament? 
Select and explain. 
A. Cementoblasts, B. Fibroblasts, C. Osteoblasts, D. Rests of Malassez
B: Fibroblasts
Answer: B: Fibroblasts 
Explanation: None