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': 'Along with polymerisation shrinkage, one of the major disadvantages of polymethyl methacrylate as denture base resin are its poor \nSelect and explain. \nA. Biological properties, B. Thermal properties, C. Mechanical properties, D. Esthetic properties', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]