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': 'Permanent deformation following strain in compression in increasing order for elastomers \nSelect and explain. \nA. Addition silicone, condensation silicone, polyether, poly sulphide, B. Poly sulphide, poly ether, Addition silicone, condensation silicone, C. Poly sulphide, poly ether, condensation silicone, Addition silicone, D. Polyether, poly sulphide, addition silicone, condensation silicone', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]