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
GIC is done for primary teeth mainly because of: 
Select and explain. 
A. Its colour, B. Its adhesion to dentin and enamel, C. Fluoride release, D. All of the above
C: Fluoride release
Answer: C: Fluoride release 
Explanation: None