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
Example of filler particle is/are: 
Select and explain. 
A. Silica, B. Quartz, C. Glass particles, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Dispersed phase of composite resins is made up of inorganic filler material.
Commonly used fillers are silicon dioxide, boron silicates and lithium aluminium silicates.
In some composites, quartz is partly replaced with heavy metal particles like quartz, glass particles, zinc, aluminium, barium, strontium or zirconium. 
Filler content ranges from 30% to 50% by volume and 50% to 85% by weight.

Ref: Textbook of Operative Dentistry, Nisha and Amit Garg, 3rd edition, Pg no:253