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': 'Light orthodontic forces produce \nSelect and explain. \nA. Light forces will not have any effect, B. Brings up osteoclasts with 10 seconds, C. Compression of blood vessel within 3-5 seconds on the pressure side, D. Compression of blood vessel in 2 hours on the tension side', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]