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
[{'content': 'Functional impression technique can be applied in: \nSelect and explain. \nA. Uniformly ﬁrm ridge consistency, B. All variety of residual ridges, C. Knife edge ridge, D. Displaceable alveolar ridge', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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.', 'role': 'assistant'}]