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
Part of the RPD to which all other components are attached either directly or indirectly is called as 
Select and explain. 
A. Major connector., B. Minor connector., C. Direct retainer., D. Indirect retainer.
A: Major connector.
Answer: A: Major connector. 
Explanation: None