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
Which is true of closed dental camp? 
Select and explain. 
A. Preselected area like school for camp, B. Serving large number of people in community, C. Resent close dental camp, D. No such term
A: Preselected area like school for camp
Answer: A: Preselected area like school for camp 
Explanation: None