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
Distal extension RPD is 
Select and explain. 
A. Both tissue and tooth borne, B. Tooth borne, C. Class III condition, D. Class IV condition
A: Both tissue and tooth borne
Answer: A: Both tissue and tooth borne 
Explanation: None