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
Functional impression technique can be applied in: 
Select and explain. 
A. Uniformly ﬁrm ridge consistency, B. All variety of residual ridges, C. Knife edge ridge, D. Displaceable alveolar ridge
A: Uniformly ﬁrm ridge consistency
Answer: A: Uniformly ﬁrm ridge consistency 
Explanation: Functional impression using tissue conditioners is a closed mouth, patient-driven impression technique, indicated for well-formed and firm ridges in patients with good dexterity and neuromuscular control.