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
Amount of pressure/Force exerted by Lip on maxillary Incisors? 
Select and explain. 
A. 10-15 gm/cm2, B. 20-25 gm/cm2, C. 25-30 gm/cm2, D. 30-35 gm/cm2
B: 20-25 gm/cm2
Answer: B: 20-25 gm/cm2 
Explanation: The average resting lip pressure was 24.59 ± 2.55g/cm2; during swallowing was 24.87 ± 2.45 g/cm2.
Ref: According to 2011, January American Journal of Orthodontics Vol.139, Issue 1, page e1-e6