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
The material used in its pure form in dentistry is: 
Select and explain. 
A. Composite, B. Silver, C. Gold, D. Amalgam
C: Gold
Answer: C: Gold 
Explanation: Pure gold has been in use in dentistry in the United States for more than 100 years. Various techniques have been advanced for its use in the restoration of teeth.
Ref: Sturdevant operative dentistry 7 ed page no e69