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
In the mandibular arch, first preference major connector for tooth-supported RPD is: 
Select and explain. 
A. Lingual bar., B. Lingual plate., C. Kennedy bar., D. All of the above.
A: Lingual bar.
Answer: A: Lingual bar. 
Explanation: None