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 ADA specification No 1 for composition of amalgam alloy, recommends, 
Select and explain. 
A. 65% silver, 32% tin and 3% copper, B. 49% silver, 32% tin and 19% copper, C. 65% silver, 29% tin and 5-6% copper, D. None of the above
C: 65% silver, 29% tin and 5-6% copper
Answer: C: 65% silver, 29% tin and 5-6% copper 
Explanation: None