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
Reciprocal anchorage is offered by 
Select and explain. 
A. Activator, B. Inter maxillary elastics, C. Maxillary expansion appliance, D. Catalan's appliance
C: Maxillary expansion appliance
Answer: C: Maxillary expansion appliance 
Explanation: None