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
Gold standard of prosthetic replacement is: 
Select and explain. 
A. Duplicate in the replacement to natural, B. Comfortable & stable in function, C. Socially acceptable in aesthetics, D. These should be maintained throughout their serviceable lifetime at a reasonable cost
A: Duplicate in the replacement to natural
Answer: A: Duplicate in the replacement to natural 
Explanation: Tooth replacement prosthesis properties:

Duplicate in the replacement to natural (Gold standard)
Appearance (socailly acceptable)
Function (comfortable & stable)
Maintenance (throughout their serviceable lifetime on reasonable cost)