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
The low thermal conductivity of impression compound is overcome by: 
Select and explain. 
A. Impression is placed in mouth till it gets cold and sudden removal of impression, B. By melting in boiling water at 50°c for one hour, C. By heating with ethanol frame and directly placing in patient's mouth., D. Heating in hot water and immediately quenching in water for 20 minutes
A: Impression is placed in mouth till it gets cold and sudden removal of impression
Answer: A: Impression is placed in mouth till it gets cold and sudden removal of impression 
Explanation: None