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
Terminal third of retentive arm is placed in 
Select and explain. 
A. Gingival third, B. Junction of gingival third and middle third, C. Middle third, D. Junction of middle and occlusal third
A: Gingival third
Answer: A: Gingival third 
Explanation: None