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': 'Class II composites are inferior to amalgam due to: \nSelect and explain. \nA. Less abrasion resistance, B. Lower compressive strength, C. Lower tensile strength, D. Greater solubility', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]