Which of the following statements is true of noble dental casting alloys?
A) They require gold and must contain at least 25% noble metals by weight.
B) They do not require gold and require less than 25% by weight of noble metals.
C) They do not require any gold but must contain at least 25% noble metals by weight.
D) They must contain at least 60% by weight of noble alloys,of which gold must account for at least 40% by weight.
Correct Answer:
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