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
Cast perforated resin retained FPD for posterior teeth was first described by 
Select and explain. 
A. Rochette, B. Livaditis, C. Tanaka, D. Thompson
B: Livaditis
Answer: B: Livaditis 
Explanation: This concept was expanded to replacement of posterior teeth by Livaditis. Perforated retainers were used to increase resistance and retention.