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
Following are the mature mineralized matrix marker of the periodontal ligament except: 
Select and explain. 
A. Type 1 and type 3 collagen., B. Osteonectin., C. Alkaline phosphate., D. Osteopontin.
A: Type 1 and type 3 collagen.
Answer: A: Type 1 and type 3 collagen. 
Explanation: Markers for Periodontal Ligament Stem Cells
1. Bone Marrow Markers

STRO-1

2. Perivascular Cell Markers

CD146
αSMA
Pericyte associated antigen 3G5
CD106

3. Mature Mineralized Matrix Markers

Alkaline phosphatase
Osteonectin
Osteopontin
Osteocalcin
Bone sialoproteins

4. Connective Tissue Protein Markers

Type I and III collagen