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 of the following is not a major maxillary metal partial denture frame work: 
Select and explain. 
A. Lingual U plate, B. Palatal strap, C. Palatal plate, D. Single palatal plate
A: Lingual U plate
Answer: A: Lingual U plate 
Explanation: None