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
In a patient with allergy to costume jewelry, which of the following is contraindicated: 
Select and explain. 
A. High gold, B. Low gold, C. Palladium — Ag, D. Ni — Cr
D: Ni — Cr
Answer: D: Ni — Cr 
Explanation: None