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
Non- working contact is needed in all except: 
Select and explain. 
A. Natural dentition., B. Complete denture., C. Distal extension RPDs, D. None.
A: Natural dentition.
Answer: A: Natural dentition. 
Explanation: In natural dentition non working contact is most damaging hence should be removed as soon as possible.