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
Pigmentation of chemicals in mucosa is due to 
Select and explain. 
A. Increased permeability of blood vessels, B. Local deposition of chemicals in mucosa, C. Sub epithelial precipitation in connective tissue at the site due to increased capillary permeability, D. None of the above
C: Sub epithelial precipitation in connective tissue at the site due to increased capillary permeability
Answer: C: Sub epithelial precipitation in connective tissue at the site due to increased capillary permeability 
Explanation: None