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': 'Amount of pressure/Force exerted by Lip on maxillary Incisors? \nSelect and explain. \nA. 10-15 gm/cm2, B. 20-25 gm/cm2, C. 25-30 gm/cm2, D. 30-35 gm/cm2', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The\xa0average resting lip pressure was 24.59 ± 2.55g/cm2; during swallowing was 24.87 ± 2.45 g/cm2.\nRef: According to 2011, January American Journal of Orthodontics Vol.139, Issue 1, page e1-e6', 'role': 'assistant'}]