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': 'When a posterior occlusal amalgam makes multiple\ncontacts with an occluding tooth surface, behaves as though it is in: \nSelect and explain. \nA. Flexion, B. Compression, C. Shear, D. Diametral compression', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]